# Error Installing cert-issuer

**URL:** <https://community.blockcerts.org/t/error-installing-cert-issuer/1962>\
**Category:** Support\
**Created:** [June 11, 2019, 8:35pm UTC](https://community.blockcerts.org/t/error-installing-cert-issuer/1962 "2019-06-11T20:35:07Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![gcervera](https://avatars.discourse-cdn.com/v4/letter/g/46a35a/32.png) [@gcervera](https://community.blockcerts.org/u/gcervera)\
**Post date:** [June 11, 2019, 8:35pm UTC](https://community.blockcerts.org/t/error-installing-cert-issuer/1962/1 "2019-06-11T20:35:07Z")

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I tried this command: python setup.py experimental --blockchain=ethereum, but at the end I got this error.

 ![error](https://us1.discourse-cdn.com/flex016/uploads/blockcerts/original/1X/5c598397cb5f4f2647335ea2dc0b389c2ad38c9b.jpeg)

I’m using python 3.7 on Windows 10. Do I need to install something else? Best regards…

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**Author:** ![aronning](https://avatars.discourse-cdn.com/v4/letter/a/47e85d/32.png) [@aronning](https://community.blockcerts.org/u/aronning)\
**Post date:** [July 17, 2019, 12:45pm UTC](https://community.blockcerts.org/t/error-installing-cert-issuer/1962/2 "2019-07-17T12:45:50Z")

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Are you running in a virtual env?

Maybe try python 3.6? I’m not sure if we’ve tested it much on 3.7. I don’t recognize pyehash or this error.

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**Author:** ![gcervera](https://avatars.discourse-cdn.com/v4/letter/g/46a35a/32.png) [@gcervera](https://community.blockcerts.org/u/gcervera)\
**Post date:** [July 17, 2019, 6:17pm UTC](https://community.blockcerts.org/t/error-installing-cert-issuer/1962/3 "2019-07-17T18:17:54Z")

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Thank you @aronning I solved it using Python 3.6.5 thank you. By the way, did you have any information about the API to install a new issuer in the Android app? What should it return to the app once the information in the API is validated. Cheers!