Sorry if i'm using the wrong form, I have no idea whether it's a configuration problem, an extension conflict or a bug.

When i try to enable Widgets from Special:ManageWikiExtensions I get an error message like this:

Internal error
[494ed42e8c431a03707d9f78] 2019-05-20 02:39:47: Fatal exception of type "TypeError"

I can still enable and disable other extensions. I have Cargo, Cite, Page Forms, Page Notice and VisualEditor enabled.

Thank you!