Error complaining that eventHelper cannot be deleted

Hi @oskarberntorp.

Since you are having issues with all mashups, it sounds like you have introduced a library that is conflicting with the ones that come with ThingWorx.  You can test this by removing your extension and then check the mashups that aren't configured to use your custom widget, to see if you're still getting errors.

Note:  if you try to test your mashup that contains your custom widget after you remove the extension, the mashup builder will remove it from the mashup, so you may want to make a copy of the mashup before doing any further changes or testing on it.

Regards.

--Sharon