ASSIGNATION ERROR during Creating multiple assignments

Hello everyone

I have a problem with the assignment of questionnaires. When I do the assignment by loading the zip file of the data to be preloaded, the following error occurs: One or more handlers failed when publishing 1 events. First event source id: 608c1c8d0a2f4b84a348c441726b9bbb. (EventHandlerException: Exception has been thrown by the target of an invocation.).

I’m looking for but don’t understand where the error comes from…I’ve gone through the file to be preloaded in detail but it doesn’t have an error.
Can you help me to find a solution to this error, please