# Problematic behavior of the extension manager

**URL:** <https://discourse.slicer.org/t/problematic-behavior-of-the-extension-manager/10986>\
**Category:** Support\
**Created:** [April 3, 2020, 11:06pm UTC](https://discourse.slicer.org/t/problematic-behavior-of-the-extension-manager/10986 "2020-04-03T23:06:33Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![dmarquette](https://avatars.discourse-cdn.com/v4/letter/d/58956e/32.png) [@dmarquette](https://discourse.slicer.org/u/dmarquette)\
**Post date:** [July 1, 2020, 8:15am UTC](https://discourse.slicer.org/t/problematic-behavior-of-the-extension-manager/10986/11 "2020-07-01T08:15:44Z")

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Operating system: macOS Catalina 10.15.5  
Slicer version: 4.11.0  
Expected behavior: open the extension manager successfully and have access to the catalog of available extensions

Actual behavior:  
When I click on the “Extension Manager” icon for the first time after launching Slicer, the following error message is always displayed.

 ![Error message (Extension Manager)](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/6/0/60280f89ae206bedb75565f080e9fc9023656cc0.jpeg)

After closing the error window by pressing the “annuler” (= cancel) button and clicking again on the “Extension Manager” icon, I can open the extension manager. The “Manage Extensions” and “Restore Extensions” tabs work fine, but the “Install Extensions” tab always remains blank with no loading symbol whatsoever.

 ![Extension manager](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/9/5/955b7d2cc603c69dac717b734f6d894c062615d4.png)

Has this problem been reported by other users?

In the meantime, I was able to install the Surface Wrap Solidify extension manually using the Extension Wizard and the extension GitHub.

Thanks for the help 🙂

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_[View the full topic](https://discourse.slicer.org/t/problematic-behavior-of-the-extension-manager/10986)._