# Cert-Viewer:ModuleNotFoundError: No module named 'flask\_themes2'

**URL:** <https://community.blockcerts.org/t/cert-viewer-no-module-named-flask-themes2/2283>\
**Category:** Technical\
**Created:** [January 16, 2020, 9:43am UTC](https://community.blockcerts.org/t/cert-viewer-no-module-named-flask-themes2/2283 "2020-01-16T09:43:27Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![raymondfx](https://sea2.discourse-cdn.com/flex016/user_avatar/community.blockcerts.org/raymondfx/32/560_2.png) [@raymondfx](https://community.blockcerts.org/u/raymondfx)\
**Post date:** [January 16, 2020, 9:43am UTC](https://community.blockcerts.org/t/cert-viewer-no-module-named-flask-themes2/2283/1 "2020-01-16T09:43:27Z")

</div>

How can I fix this error when trying to run cert-viewer

```
`Traceback (most recent call last):

```

File “run.py”, line 4, in   
from cert\_viewer import configure\_app  
File “/Users/Dorris/cert-viewer/cert\_viewer/ **init**.py”, line 6, in   
from flask\_themes2 import (Themes)  
ModuleNotFoundError: No module named ‘flask\_themes2’`