# No module named 'cert\_core'

**URL:** <https://community.blockcerts.org/t/no-module-named-cert-core/843>\
**Category:** Support\
**Created:** [March 4, 2018, 1:09am UTC](https://community.blockcerts.org/t/no-module-named-cert-core/843 "2018-03-04T01:09:16Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Exp386](https://avatars.discourse-cdn.com/v4/letter/e/c37758/32.png) [@Exp386](https://community.blockcerts.org/u/Exp386)\
**Post date:** [March 4, 2018, 1:09am UTC](https://community.blockcerts.org/t/no-module-named-cert-core/843/1 "2018-03-04T01:09:16Z")

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I have installed cert-verifier by cloning from Github and using pip3 (I have got Python3). I didn’t receive any error msg during the installation process.  
However when I run “py verifier.py” it gives me the following error msg:

Traceback (most recent call last):  
File “verifier.py”, line 14, in   
from cert\_core import to\_certificate\_model  
ModuleNotFoundError: No module named ‘cert\_core’

Could someone help?

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<div class="post-metadata">

**Author:** ![d.hussain](https://avatars.discourse-cdn.com/v4/letter/d/4af34b/32.png) [@d.hussain](https://community.blockcerts.org/u/d.hussain)\
**Post date:** [March 20, 2018, 4:49am UTC](https://community.blockcerts.org/t/no-module-named-cert-core/843/2 "2018-03-20T04:49:05Z")

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Try python 2. It is working for us with Python2