This error normally occurs launching Citrix applications from Google Chrome for Mac after reinstalling the new Citrix Receiver.
The fix is very simple!
- Just navigate to the OS Volume (in the image below is Macintosh HD) then /Library/Internet Plug-Ins/
- Delete the plugin "CitrixICAClientPlugin.plugin".
- Relaunch the app from Chrome and you should be fine!



Could not load Citrix online plug-In (Google Chrome for Mac)