Hey guys,
I am experiencing some issues with the "Append with Transformation" Tool. Usually I could easily add some data to my Utility Network but somehow it won't work anymore. All I get is the error message shown in the image.

I tried to set up a new Utility Network and add some data, but the error remains. I am a little confused because last week I had no problems yet. Do you know what to do here?
Thanks in Advance!
Greetings from Germany
Luca