# After installation of pyMC4, pytest is failing with "ModuleNotFoundError: No module named 'aesara'"

**URL:** <https://discourse.pymc.io/t/after-installation-of-pymc4-pytest-is-failing-with-modulenotfounderror-no-module-named-aesara/9290>\
**Category:** v5\
**Tags:** development, development\_env\
**Created:** [April 27, 2022, 6:52am UTC](https://discourse.pymc.io/t/after-installation-of-pymc4-pytest-is-failing-with-modulenotfounderror-no-module-named-aesara/9290 "2022-04-27T06:52:50Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![anne](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/anne/32/5275_2.png) [@anne](https://discourse.pymc.io/u/anne)\
**Post date:** [April 27, 2022, 2:26pm UTC](https://discourse.pymc.io/t/after-installation-of-pymc4-pytest-is-failing-with-modulenotfounderror-no-module-named-aesara/9290/8 "2022-04-27T14:26:30Z")

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That is what I am saying - I have the conda env (pymc-dev-py39), yet it is not working for me. ☹

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_[View the full topic](https://discourse.pymc.io/t/after-installation-of-pymc4-pytest-is-failing-with-modulenotfounderror-no-module-named-aesara/9290)._