This may be a duplicate, because this error is pretty common in every part of sharepoint. However, the search function didn't find anything for my particular problem.
To the problem: I have a List template which I want to use on a subsite. Creating the list and adding items works wonderful. Here is the list, which I'm talking about:
Now the problem, when I click on a list item, for detail view or edit mode, it runs into a
NullReferenceException: Object reference not set to an instance of an object.
exception. Here a picture of the error:
So, the funny thing is, when I get the list items via VS everything works fine and it receives the listitems as expected. See this picture:
And as mentioned above, the list items are visible in the list itself. This error only occurs if you click on an item in the list.
Does anyone know, how to solf this issue?
thanks so far. Jürgen
Content type in request:
In sharepoint designer: