# Installing non-matching extension from file - better error message is needed

**URL:** <https://discourse.slicer.org/t/installing-non-matching-extension-from-file-better-error-message-is-needed/4121>\
**Category:** Support\
**Tags:** extensions-manager\
**Created:** [September 14, 2018, 8:31pm UTC](https://discourse.slicer.org/t/installing-non-matching-extension-from-file-better-error-message-is-needed/4121 "2018-09-14T20:31:21Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![fedorov](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/fedorov/32/14_2.png) [@fedorov](https://discourse.slicer.org/u/fedorov)\
**Post date:** [September 14, 2018, 8:31pm UTC](https://discourse.slicer.org/t/installing-non-matching-extension-from-file-better-error-message-is-needed/4121/1 "2018-09-14T20:31:21Z")

</div>

I was testing installation of extensions from files. When I by mistake tried to install extension package that did not have a matching revision number, I was getting a cryptic error (screenshot below). It would be much more helpful if there was an error that the extension package revision number does not match the one of the application.

I also noticed that after installing extensions from file there was no prompt to restart Slicer.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/d/f/df441f14908831baadd799a6cad9fb7312937181.png)