XF 1.5 MyBB to Xenforo, Failer attachments

I have a bigger project in mind. I have imported my Woltlab forum to MyBB
(without avatars and attachments) and now wants to move from MyBB to Xenforo.
unfortunately he tells me this:

The attachments directory could not be found.

I've been trying to figure this out for hours. unfortunately nothing. I have created an attachments folder on the FTP everywhere, but it doesn't help.

can anyone help me?

Thank you

@edit: Pls closed :) Problem Finished
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