# Getting KeyError '' when launching prodigy

**URL:** <https://support.prodi.gy/t/getting-keyerror-when-launching-prodigy/3203>\
**Category:** Uncategorized\
**Tags:** done, solved, third-party, server\
**Created:** [July 18, 2020, 8:08pm UTC](https://support.prodi.gy/t/getting-keyerror-when-launching-prodigy/3203 "2020-07-18T20:08:22Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![ines](https://sea2.discourse-cdn.com/flex020/user_avatar/support.prodi.gy/ines/32/3_2.png) [@ines](https://support.prodi.gy/u/ines)\
**Post date:** [July 19, 2020, 9:38am UTC](https://support.prodi.gy/t/getting-keyerror-when-launching-prodigy/3203/2 "2020-07-19T09:38:16Z")

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Hi! It seems like a new version of `uvicorn` (the library that Prodigy uses for to serve the app) introduced a backwards-incompatible change. We'll release a new Prodigy version with the required change soon, but in the meantime, downgrading `uvicorn` should fix it:

> [@Installation error linux \_get\_module\_details fails](https://support.prodi.gy/t/installation-error-linux-get-module-details-fails/3199/4):
>
> Yup, downgrading uvicorn to 0.11.5 fixes this issue. pip install uvicorn==0.11.5

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_[View the full topic](https://support.prodi.gy/t/getting-keyerror-when-launching-prodigy/3203)._