Unable to load assembly group. The user assembly group provider was unable to provide any user assemblies for the specified assembly group.

25/06/2013 18:11

Unable to load assembly group. The user assembly group provider was unable to provide any user assemblies for the specified assembly group.

 

Error above was caused by coding error or typo:

- all receivers in elements.xml has to have definition in codebehind
- namespace and class must be the same as in codebehind

 

It also appears when we had ItemAdding event receiver on list and we were adding list items by Powershell. Workaround was to deactivate web feature in event receiver (by powershell before adding items), add items and then activate feature.