I'm trying to delete a feature class from a feature dataset or to add a field to it, but I keep getting an error message (pics attached below). I have imported a geometric network I've created from one PGDB to another. However couldn't add any fields. I'm receiving the following error:
Than I planned to delete the feature classes that were imported - I've received the following error:
I have the feeling that both errors are related but couldn't figure out the problem from ESRI help or from other posts in gis.stackexchange.