# Unexpected error when testing Pymc3 installation on Windows 10 and Anaconda

**URL:** <https://discourse.pymc.io/t/unexpected-error-when-testing-pymc3-installation-on-windows-10-and-anaconda/7852>\
**Category:** Questions\
**Created:** [August 5, 2021, 10:10pm UTC](https://discourse.pymc.io/t/unexpected-error-when-testing-pymc3-installation-on-windows-10-and-anaconda/7852 "2021-08-05T22:10:28Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![sree\_datta](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/sree_datta/32/4337_2.png) [@sree\_datta](https://discourse.pymc.io/u/sree_datta)\
**Post date:** [August 5, 2021, 10:10pm UTC](https://discourse.pymc.io/t/unexpected-error-when-testing-pymc3-installation-on-windows-10-and-anaconda/7852/1 "2021-08-05T22:10:29Z")

</div>

Hi I’m using a Windows 10 64-bit machine with Anaconda (Anaconda3-2021.05-Windows-x86\_64). I have admin rights on my laptop. I followed the installation instructions given here for Windows using the “environment.yml” files approach.  
[Installation Guide (Windows) · pymc-devs/pymc3 Wiki · GitHub](https://github.com/pymc-devs/pymc3/wiki/Installation-Guide-(Windows))

Then I began to test my installation of Pymc3 using the Getting Started Guide found here: [Getting started with PyMC3 — PyMC3 3.10.0 documentation](http://docs.pymc.io/notebooks/getting_started)

I was able to successfully complete both the (1) Linear Regression and (2) Stock Market Return examples without any errors. When I ran the example (3) Coal Mine Disasters is when I got the following error (Note that I ran all examples in one go and I did not make any changes to my environment in any way between testing the examples):

```auto
Exception: ('Compilation failed (return status=1): C:\\Users\\SreeDatta\\AppData\\Local\\Temp\\ccEWCiGI.s: Assembler messages:\r. C:\\Users\\SreeDatta\\AppData\\Local\\Temp\\ccEWCiGI.s:367: Error: invalid register for .seh_savexmm\r. ', 'FunctionGraph(Elemwise{eq,no_inplace}(<TensorType(int64, vector)>, <TensorType(int8, (True,))>))')

```

This appears to be an error coming from Theano. I’m hoping one of can help with this error. I have a base installation of Anaconda and created a new environment using the “environment.yml” file. Here are all the packages in my “pm3env”

```auto
# packages in environment at C:\ProgramData\Anaconda3\envs\pm3env:
#
# Name Version Build Channel
argon2-cffi 20.1.0 py37hcc03f2d_2 conda-forge
arviz 0.11.1 pypi_0 pypi
async_generator 1.10 py_0 conda-forge
attrs 21.2.0 pyhd8ed1ab_0 conda-forge
backcall 0.2.0 pyh9f0ad1d_0 conda-forge
backports 1.0 py_2 conda-forge
backports.functools_lru_cache 1.6.4 pyhd8ed1ab_0 conda-forge
bambi 0.5.0 pypi_0 pypi
blas 1.0 mkl
bleach 4.0.0 pyhd8ed1ab_0 conda-forge
ca-certificates 2021.5.30 h5b45459_0 conda-forge
cached-property 1.5.2 pypi_0 pypi
cachetools 4.2.2 pypi_0 pypi
cairo 1.16.0 hb19e0ff_1008 conda-forge
certifi 2021.5.30 py37h03978a9_0 conda-forge
cffi 1.14.6 py37hd8e9650_0 conda-forge
cftime 1.5.0 pypi_0 pypi
colorama 0.4.4 pyh9f0ad1d_0 conda-forge
cycler 0.10.0 py_2 conda-forge
decorator 5.0.9 pyhd8ed1ab_0 conda-forge
defusedxml 0.7.1 pyhd8ed1ab_0 conda-forge
dill 0.3.4 pypi_0 pypi
entrypoints 0.3 pyhd8ed1ab_1003 conda-forge
et-xmlfile 1.1.0 pypi_0 pypi
expat 2.4.1 h39d44d4_0 conda-forge
fastprogress 1.0.0 pypi_0 pypi
filelock 3.0.12 pypi_0 pypi
font-ttf-dejavu-sans-mono 2.37 hab24e00_0 conda-forge
font-ttf-inconsolata 3.000 h77eed37_0 conda-forge
font-ttf-source-code-pro 2.038 h77eed37_0 conda-forge
font-ttf-ubuntu 0.83 hab24e00_0 conda-forge
fontconfig 2.13.1 h1989441_1005 conda-forge
fonts-conda-ecosystem 1 0 conda-forge
fonts-conda-forge 1 0 conda-forge
formulae 0.1.3 pypi_0 pypi
freetype 2.10.4 h546665d_1 conda-forge
fribidi 1.0.10 h8d14728_0 conda-forge
getopt-win32 0.1 h8ffe710_0 conda-forge
gettext 0.19.8.1 h1a89ca6_1005 conda-forge
graphite2 1.3.13 1000 conda-forge
graphviz 2.48.0 hefbd956_0 conda-forge
gts 0.7.6 h7c369d9_2 conda-forge
h5py 3.1.0 pypi_0 pypi
harfbuzz 2.8.2 hc601d6f_0 conda-forge
icc_rt 2019.0.0 h0cc432a_1
icu 68.1 h0e60522_0 conda-forge
importlib-metadata 2.1.1 pypi_0 pypi
intel-openmp 2021.3.0 h57928b3_3372 conda-forge
ipykernel 5.5.5 py37h7813e69_0 conda-forge
ipython 7.26.0 py37h4038f58_0 conda-forge
ipython_genutils 0.2.0 py_1 conda-forge
ipywidgets 7.6.3 pyhd3eb1b0_1
jbig 2.1 h8d14728_2003 conda-forge
jedi 0.18.0 py37h03978a9_2 conda-forge
jinja2 3.0.1 pyhd8ed1ab_0 conda-forge
jpeg 9d h8ffe710_0 conda-forge
jsonschema 3.2.0 pyhd8ed1ab_3 conda-forge
jupyter 1.0.0 py37_7
jupyter_client 6.1.12 pyhd8ed1ab_0 conda-forge
jupyter_console 6.4.0 pyhd8ed1ab_0 conda-forge
jupyter_core 4.7.1 py37h03978a9_0 conda-forge
jupyterlab_pygments 0.1.2 pyh9f0ad1d_0 conda-forge
jupyterlab_widgets 1.0.0 pyhd8ed1ab_1 conda-forge
kiwisolver 1.3.1 py37h8c56517_1 conda-forge
lcms2 2.12 h2a16943_0 conda-forge
lerc 2.2.1 h0e60522_0 conda-forge
libclang 11.1.0 default_h5c34c98_1 conda-forge
libdeflate 1.7 h8ffe710_5 conda-forge
libffi 3.3 h0e60522_2 conda-forge
libgd 2.3.2 h138e682_0 conda-forge
libglib 2.68.3 h1e62bf3_0 conda-forge
libiconv 1.16 he774522_0 conda-forge
libpng 1.6.37 h1d00b33_2 conda-forge
libpython 2.1 py37_0
libsodium 1.0.18 h8d14728_1 conda-forge
libtiff 4.3.0 h0c97f57_1 conda-forge
libwebp 1.2.0 h57928b3_0 conda-forge
libwebp-base 1.2.0 h8ffe710_2 conda-forge
libxcb 1.13 hcd874cb_1003 conda-forge
libxml2 2.9.12 hf5bbc77_0 conda-forge
llvmlite 0.36.0 py37habb0c8c_0 conda-forge
lz4-c 1.9.3 h8ffe710_1 conda-forge
m2w64-gcc-libgfortran 5.3.0 6 conda-forge
m2w64-gcc-libs 5.3.0 7 conda-forge
m2w64-gcc-libs-core 5.3.0 7 conda-forge
m2w64-gmp 6.1.0 2 conda-forge
m2w64-libwinpthread-git 5.0.0.4634.697f757 2 conda-forge
markupsafe 2.0.1 py37hcc03f2d_0 conda-forge
matplotlib 3.3.2 haa95532_0
matplotlib-base 3.3.2 py37h3379fd5_1 conda-forge
matplotlib-inline 0.1.2 pyhd8ed1ab_2 conda-forge
mistune 0.8.4 py37hcc03f2d_1004 conda-forge
mkl 2020.4 hb70f87d_311 conda-forge
mkl-service 2.3.0 py37h196d8e1_0
mkl_fft 1.3.0 py37hda49f71_1 conda-forge
mkl_random 1.2.0 py37h414f9d2_1 conda-forge
mpmath 1.2.1 pyhd8ed1ab_0 conda-forge
msys2-conda-epoch 20160418 1 conda-forge
nbclient 0.5.3 pyhd8ed1ab_0 conda-forge
nbconvert 6.1.0 py37h03978a9_0 conda-forge
nbformat 5.1.3 pyhd8ed1ab_0 conda-forge
nest-asyncio 1.5.1 pyhd8ed1ab_0 conda-forge
netcdf4 1.5.7 pypi_0 pypi
notebook 6.4.0 pyha770c72_0 conda-forge
numba 0.53.1 py37h4e635f9_0 conda-forge
numpy 1.19.2 py37hadc3359_0
numpy-base 1.19.2 py37ha3acd2a_0
olefile 0.46 pyh9f0ad1d_1 conda-forge
openjpeg 2.4.0 hb211442_1 conda-forge
openpyxl 3.0.7 pypi_0 pypi
openssl 1.1.1k h8ffe710_0 conda-forge
packaging 21.0 pyhd8ed1ab_0 conda-forge
pandas 1.2.1 py37hf11a4ad_0
pandoc 2.14.1 h8ffe710_0 conda-forge
pandocfilters 1.4.2 py_1 conda-forge
pango 1.48.7 hd84fcdd_0 conda-forge
parso 0.8.2 pyhd8ed1ab_0 conda-forge
patsy 0.5.1 pypi_0 pypi
pcre 8.45 h0e60522_0 conda-forge
pickleshare 0.7.5 py_1003 conda-forge
pillow 8.3.1 py37hd7d9ad0_0 conda-forge
pip 20.3.3 py37haa95532_0
pixman 0.40.0 h8ffe710_0 conda-forge
prometheus_client 0.11.0 pyhd8ed1ab_0 conda-forge
prompt-toolkit 3.0.19 pyha770c72_0 conda-forge
prompt_toolkit 3.0.19 hd8ed1ab_0 conda-forge
pthread-stubs 0.4 hcd874cb_1001 conda-forge
pycparser 2.20 pyh9f0ad1d_2 conda-forge
pygments 2.9.0 pyhd8ed1ab_0 conda-forge
pymc3 3.11.2 pypi_0 pypi
pyparsing 2.4.7 pyh9f0ad1d_0 conda-forge
pyqt 5.12.3 py37h03978a9_7 conda-forge
pyqt-impl 5.12.3 py37hf2a7229_7 conda-forge
pyqt5-sip 4.19.18 py37hf2a7229_7 conda-forge
pyqtchart 5.12 py37hf2a7229_7 conda-forge
pyqtwebengine 5.12.1 py37hf2a7229_7 conda-forge
pyrsistent 0.17.3 py37hcc03f2d_2 conda-forge
python 3.7.9 h60c2a47_0
python-dateutil 2.8.2 pyhd8ed1ab_0 conda-forge
python-graphviz 0.16 pyh243d235_2 conda-forge
python_abi 3.7 2_cp37m conda-forge
pytz 2021.1 pyhd8ed1ab_0 conda-forge
pywin32 300 py37hcc03f2d_0 conda-forge
pywinpty 1.1.3 py37h7f67f24_0 conda-forge
pyzmq 22.2.0 py37hcce574b_0 conda-forge
qt 5.12.9 h5909a2a_4 conda-forge
qtconsole 5.1.1 pyhd8ed1ab_0 conda-forge
qtpy 1.9.0 py_0 conda-forge
scipy 1.7.1 pypi_0 pypi
semver 2.13.0 pypi_0 pypi
send2trash 1.7.1 pyhd8ed1ab_0 conda-forge
setuptools 49.6.0 py37h03978a9_3 conda-forge
six 1.16.0 pyh6c4a22f_0 conda-forge
sqlite 3.36.0 h8ffe710_0 conda-forge
statsmodels 0.12.2 pypi_0 pypi
sympy 1.7.1 py37h03978a9_1 conda-forge
terminado 0.10.1 py37h03978a9_0 conda-forge
testpath 0.5.0 pyhd8ed1ab_0 conda-forge
theano-pymc 1.1.2 pypi_0 pypi
tk 8.6.10 h8ffe710_1 conda-forge
tornado 6.1 py37hcc03f2d_1 conda-forge
traitlets 5.0.5 py_0 conda-forge
typing 3.7.4.3 pypi_0 pypi
typing_extensions 3.10.0.0 pyha770c72_0 conda-forge
ucrt 10.0.20348.0 h57928b3_0 conda-forge
vc 14.2 hb210afc_5 conda-forge
vs2015_runtime 14.29.30037 h902a5da_5 conda-forge
watermark 2.2.0 pypi_0 pypi
wcwidth 0.2.5 pyh9f0ad1d_2 conda-forge
webencodings 0.5.1 py_1 conda-forge
wheel 0.36.2 pyhd3deb0d_0 conda-forge
widgetsnbextension 3.5.1 py37h03978a9_4 conda-forge
wincertstore 0.2 py37h03978a9_1006 conda-forge
winpty 0.4.3 4 conda-forge
xarray 0.16.2 pypi_0 pypi
xorg-kbproto 1.0.7 hcd874cb_1002 conda-forge
xorg-libice 1.0.10 hcd874cb_0 conda-forge
xorg-libsm 1.2.3 hcd874cb_1000 conda-forge
xorg-libx11 1.7.2 hcd874cb_0 conda-forge
xorg-libxau 1.0.9 hcd874cb_0 conda-forge
xorg-libxdmcp 1.1.3 hcd874cb_0 conda-forge
xorg-libxext 1.3.4 hcd874cb_1 conda-forge
xorg-libxpm 3.5.13 hcd874cb_0 conda-forge
xorg-libxt 1.2.1 hcd874cb_2 conda-forge
xorg-xextproto 7.3.0 hcd874cb_1002 conda-forge
xorg-xproto 7.0.31 hcd874cb_1007 conda-forge
xz 5.2.5 h62dcd97_1 conda-forge
zeromq 4.3.4 h0e60522_0 conda-forge
zipp 3.5.0 pyhd8ed1ab_0 conda-forge
zlib 1.2.11 h62dcd97_1010 conda-forge
zstd 1.5.0 h6255e5f_0 conda-forge

```

Here is the code I tried to run:

```auto
with pm.Model() as disaster_model:

    switchpoint = pm.DiscreteUniform(
        "switchpoint", lower=years.min(), upper=years.max(), testval=1900
    )

    # Priors for pre- and post-switch rates number of disasters
    early_rate = pm.Exponential("early_rate", 1.0)
    late_rate = pm.Exponential("late_rate", 1.0)

    # Allocate appropriate Poisson rates to years before and after current
    rate = pm.math.switch(switchpoint >= years, early_rate, late_rate)

    disasters = pm.Poisson("disasters", rate, observed=disaster_data)

```

Here is the complete traceback of the error I got:

```auto
You can find the C code in this temporary file: C:\Users\SreeDatta\AppData\Local\Temp\theano_compilation_error_f10nrpwx
---------------------------------------------------------------------------
Exception Traceback (most recent call last)
<ipython-input-20-392de9deec43> in <module>
     12 rate = pm.math.switch(switchpoint >= years, early_rate, late_rate)
     13 
---> 14 disasters = pm.Poisson("disasters", rate, observed=disaster_data)

C:\ProgramData\Anaconda3\envs\pm3env\lib\site-packages\pymc3\distributions\distribution.py in __new__ (cls, name, *args, **kwargs)
    120 else:
    121 dist = cls.dist(*args, **kwargs)
--> 122 return model.Var(name, dist, data, total_size, dims=dims)
    123 
    124 def __getnewargs__ (self):

C:\ProgramData\Anaconda3\envs\pm3env\lib\site-packages\pymc3\model.py in Var(self, name, dist, data, total_size, dims)
   1180 distribution=dist,
   1181 total_size=total_size,
-> 1182 model=self,
   1183 )
   1184 self.observed_RVs.append(var)

C:\ProgramData\Anaconda3\envs\pm3env\lib\site-packages\pymc3\model.py in __init__ (self, type, owner, index, name, data, distribution, total_size, model)
   1826 
   1827 self.missing_values = data.missing_values
-> 1828 self.logp_elemwiset = distribution.logp(data)
   1829 # The logp might need scaling in minibatches.
   1830 # This is done in `Factor`.

C:\ProgramData\Anaconda3\envs\pm3env\lib\site-packages\pymc3\distributions\discrete.py in logp(self, value)
    704 """
    705 mu = self.mu
--> 706 log_prob = bound(logpow(mu, value) - factln(value) - mu, mu >= 0, value >= 0)
    707 # Return zero when mu and value are both zero
    708 return tt.switch(tt.eq(mu, 0) * tt.eq(value, 0), 0, log_prob)

C:\ProgramData\Anaconda3\envs\pm3env\lib\site-packages\pymc3\distributions\dist_math.py in logpow(x, m)
    106 """
    107 # return m * log(x)
--> 108 return tt.switch(tt.eq(x, 0), tt.switch(tt.eq(m, 0), 0.0, -np.inf), m * tt.log(x))
    109 
    110 

C:\ProgramData\Anaconda3\envs\pm3env\lib\site-packages\theano\graph\op.py in __call__ (self, *inputs, **kwargs)
    251 
    252 if config.compute_test_value != "off":
--> 253 compute_test_value(node)
    254 
    255 if self.default_output is not None:

C:\ProgramData\Anaconda3\envs\pm3env\lib\site-packages\theano\graph\op.py in compute_test_value(node)
    124 
    125 # Create a thunk that performs the computation
--> 126 thunk = node.op.make_thunk(node, storage_map, compute_map, no_recycling=[])
    127 thunk.inputs = [storage_map[v] for v in node.inputs]
    128 thunk.outputs = [storage_map[v] for v in node.outputs]

C:\ProgramData\Anaconda3\envs\pm3env\lib\site-packages\theano\graph\op.py in make_thunk(self, node, storage_map, compute_map, no_recycling, impl)
    632 )
    633 try:
--> 634 return self.make_c_thunk(node, storage_map, compute_map, no_recycling)
    635 except (NotImplementedError, MethodNotDefined):
    636 # We requested the c code, so don't catch the error.

C:\ProgramData\Anaconda3\envs\pm3env\lib\site-packages\theano\graph\op.py in make_c_thunk(self, node, storage_map, compute_map, no_recycling)
    599 raise NotImplementedError("float16")
    600 outputs = cl.make_thunk(
--> 601 input_storage=node_input_storage, output_storage=node_output_storage
    602 )
    603 thunk, node_input_filters, node_output_filters = outputs

C:\ProgramData\Anaconda3\envs\pm3env\lib\site-packages\theano\link\c\basic.py in make_thunk(self, input_storage, output_storage, storage_map)
   1202 init_tasks, tasks = self.get_init_tasks()
   1203 cthunk, module, in_storage, out_storage, error_storage = self. __compile__ (
-> 1204 input_storage, output_storage, storage_map
   1205 )
   1206 

C:\ProgramData\Anaconda3\envs\pm3env\lib\site-packages\theano\link\c\basic.py in __compile__ (self, input_storage, output_storage, storage_map)
   1140 input_storage,
   1141 output_storage,
-> 1142 storage_map,
   1143 )
   1144 return (

C:\ProgramData\Anaconda3\envs\pm3env\lib\site-packages\theano\link\c\basic.py in cthunk_factory(self, error_storage, in_storage, out_storage, storage_map)
   1632 for node in self.node_order:
   1633 node.op.prepare_node(node, storage_map, None, "c")
-> 1634 module = get_module_cache().module_from_key(key=key, lnk=self)
   1635 
   1636 vars = self.inputs + self.outputs + self.orphans

C:\ProgramData\Anaconda3\envs\pm3env\lib\site-packages\theano\link\c\cmodule.py in module_from_key(self, key, lnk)
   1189 try:
   1190 location = dlimport_workdir(self.dirname)
-> 1191 module = lnk.compile_cmodule(location)
   1192 name = module. __file__
   1193 assert name.startswith(location)

C:\ProgramData\Anaconda3\envs\pm3env\lib\site-packages\theano\link\c\basic.py in compile_cmodule(self, location)
   1548 lib_dirs=self.lib_dirs(),
   1549 libs=libs,
-> 1550 preargs=preargs,
   1551 )
   1552 except Exception as e:

C:\ProgramData\Anaconda3\envs\pm3env\lib\site-packages\theano\link\c\cmodule.py in compile_str(module_name, src_code, location, include_dirs, lib_dirs, libs, preargs, py_module, hide_symbols)
   2545 compile_stderr = compile_stderr.replace("\n", ". ")
   2546 raise Exception(
-> 2547 f"Compilation failed (return status={status}): {compile_stderr}"
   2548 )
   2549 elif config.cmodule__compilation_warning and compile_stderr:

Exception: ('Compilation failed (return status=1): C:\\Users\\SreeDatta\\AppData\\Local\\Temp\\ccEWCiGI.s: Assembler messages:\r. C:\\Users\\SreeDattappData\\Local\\Temp\\ccEWCiGI.s:367: Error: invalid register for .seh_savexmm\r. ', 'FunctionGraph(Elemwise{eq,no_inplace}(<TensorType(int64, vector)>, <TensorType(int8, (True,))>))')

```

​  
Thanks in advance for your help.

---

<div class="post-metadata">

**Author:** ![rosgori](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/rosgori/32/1077_2.png) [@rosgori](https://discourse.pymc.io/u/rosgori)\
**Post date:** [August 9, 2021, 6:33am UTC](https://discourse.pymc.io/t/unexpected-error-when-testing-pymc3-installation-on-windows-10-and-anaconda/7852/2 "2021-08-09T06:33:35Z")

</div>

> [@sree\_datta](#):
>
> `Error: invalid register for .seh_savexmm\r.`

Look at [this](https://github.com/pymc-devs/pymc3/issues/4749).

---

<div class="post-metadata">

**Author:** ![sree\_datta](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/sree_datta/32/4337_2.png) [@sree\_datta](https://discourse.pymc.io/u/sree_datta)\
**Post date:** [August 9, 2021, 8:00pm UTC](https://discourse.pymc.io/t/unexpected-error-when-testing-pymc3-installation-on-windows-10-and-anaconda/7852/3 "2021-08-09T20:00:17Z")

</div>

@rosgori thanks for the link. That was the first resource I had examined thoroughly to see how the errors can be corrected. I followed the specific installation instructions and that helped me run the Linear Regression and Stock Market examples provided in the “Pymc3 Getting Started” page. I was using the example code verbatim.  
The error occurs again in the third example “Coal Mine Disasters” model. My code shows that Pymc3 is correctly assigning NUTS for Continuous variables and Metropolis for the Discrete (the Count of Coal mine accidents) but yet the error crops up. I have removed the environment and reinstalled per the specifications given in the link you shared. The error does not go away.

Could you try to replicate the Coal Mine disasters example given at this link and see if you are able to replicate the error I’m getting? See the link below  
[http://docs.pymc.io/notebooks/getting\_started](http://docs.pymc.io/notebooks/getting_started)

Thanks again for your help - Sree

---

<div class="post-metadata">

**Author:** ![rosgori](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/rosgori/32/1077_2.png) [@rosgori](https://discourse.pymc.io/u/rosgori)\
**Post date:** [August 9, 2021, 8:22pm UTC](https://discourse.pymc.io/t/unexpected-error-when-testing-pymc3-installation-on-windows-10-and-anaconda/7852/4 "2021-08-09T20:22:17Z")

</div>

In my case, I don’t see those errors (I am not using Windows 10, I have Ubuntu 20.04), so I cannot help with that.

---

<div class="post-metadata">

**Author:** ![sree\_datta](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/sree_datta/32/4337_2.png) [@sree\_datta](https://discourse.pymc.io/u/sree_datta)\
**Post date:** [August 9, 2021, 10:24pm UTC](https://discourse.pymc.io/t/unexpected-error-when-testing-pymc3-installation-on-windows-10-and-anaconda/7852/5 "2021-08-09T22:24:27Z")

</div>

Thanks for confirming @rosgori at least on Ubuntu. I have tested that example (Coal Mine Disasters) now on two other machines with fresh Anaconda3 installs (Windows 8.1 with Anaconda3-64 bit & Ubuntu 20.04 with Anaconda3-64bit). I get the same error. Something is broken and I do not yet know what it is.

Sree

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**Author:** ![sree\_datta](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/sree_datta/32/4337_2.png) [@sree\_datta](https://discourse.pymc.io/u/sree_datta)\
**Post date:** [August 16, 2021, 7:21pm UTC](https://discourse.pymc.io/t/unexpected-error-when-testing-pymc3-installation-on-windows-10-and-anaconda/7852/6 "2021-08-16T19:21:32Z")

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I found out with help from @michaelosthege and @tomicapretto over the past few days that my Windows 10 machine may be having a clash of `mingw` compilers. I use both R and Anaconda for my Statistics and Data Science work.

The Bayesian models I work with in R uses the Stan packages that need C and C++ compilers (via RTools that uses the mingw C and C++ compilers through Msys2). In the System environment variables, RTools is first on the PATH.

@michaelosthege had posted his USER Path variables and that showed that my Python compilation was not using `m2w64 tool chain` in Anaconda, but was using the compilers from RTools.

So I changed the name of the RTools folder and ensured that the System PATH variable would not work and the these mingw compilers could not be found. Then when I ran a simple command `import theano as tp` it gave me an error `Error: g++ cannot be found...`

Next I set up my User PATH variables and pointed them to the correct location of the mingw compilers in the Base Anaconda3 installation. All of my Pymc3 models are being compiled correctly.

Thanks everyone for your time and your help - Sree