# Can not access Extension Manager

**URL:** <https://discourse.slicer.org/t/can-not-access-extension-manager/12754>\
**Category:** Support\
**Created:** [July 28, 2020, 4:03am UTC](https://discourse.slicer.org/t/can-not-access-extension-manager/12754 "2020-07-28T04:03:41Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![11140](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/11140/32/7102_2.png) [@11140](https://discourse.slicer.org/u/11140)\
**Post date:** [July 28, 2020, 4:03am UTC](https://discourse.slicer.org/t/can-not-access-extension-manager/12754/1 "2020-07-28T04:03:41Z")

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Dear Sir, I want to access Extension Manager to install some extension, however, an error happens:

Operating system: Mac High Seria 10.13.6  
Slicer version: Slicer-4.11.0-2020-07-20-macosx-amd64  
Expected behavior: access the extension manager  
Actual behavior: can not access the extension manager, have a warning: There is not an application to open **URL data:text/html** ; **charset=UTF-8** , **%3Cstyle%20type%3D%27text%2Fcss%27%3E%20%20div.viewWrapperSlicer%7B%20%20%20%20font-**

Thank you!

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/7/b/7b89ea3558e036c295389c01d7924e07b267b5c7.png)