[Solved] Create a topic error with plugin

Hello,

just bought and activated advanced attachments. Now i have an error always creating a post with or without attachment. The topic is created and the image is also there, but always when i click on "add topic" the error occours.

wpForo Version wp1.9.5

wpForo Advanced Attachments 2.0.8

I already tried to deactivate the plugin, but the error still occours now every time i want to create a topic/post.

Any idea what is wrong now?

Thx for your help!