Composer write error

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I dont know, at which time this error cames up. Many pages I did create with composer. But now if I try to write a new blog entry, an "unexpected error" occurs (attachement) and URL:
http://www.amip.de/index.php/dashboard/composer/write/4/...

I can go to drafts, where now a new page with no title exists, edit this and place it manually on the right position. Also the draft count always shows 1 more than real. Will be there any help?
Thank you,
Jens

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