Okay, I've now sent a screenshot of the error twice as an attachment to the mail. But I'm expected to take a screenshot of the error, upload it to my website via FTP, then create a link from it and post it in the forum. The effort involved is disproportionate to the screenshots sent by email. And since I am very angry about this, I want this case to be closed now. I will not seek this support again for any error. Why the hell don't you allow an upload on the forum page? That can't be that difficult, every other provider has something like that!
And yes, in my eyes THIS problem is solved!