I'm working with a geometric network within a personal geodatabase. I've imported a feature class the was topologically fixed from one PGDB to another. Than created a geometric network with weights. When I've tried to add new weights I've received an error (don't have a print screen). I've restarted ArcMap, but the .mxd couldn't locate the feature classes. When I've located it for ArcMap I've received the following error. (It is the second time that it happens - exporting the feature class before forming a geometric network didn't work). What have I done wrong?