[Montellese]

Ah I think I might know what the problem is. Can you try installing the mediaimporter.emby add-on from the ZIP file? Because with the pre-installed add-on Kodi does not properly install the necessary dependencies. You can

• either install the add-on from the ZIP file
  
• or go to Add-ons -> My add-ons -> Media importer -> Emby Media Importer 
  • Enable
    
  • Dependencies
    • Click on every uninstalled dependency and use the "Install" button
      

Once all dependencies have been installed things should look better. The Plex Media Importer add-on uses the same dependencies so you only need to do this for one of the two add-ons.
But it's still odd because I don't know how the "Test connection" button works without the "requests" library being installed
And it also doesn't really explain the crash yet. But one step at a time.