I was actually thinking along the same lines... only I thought that the error statement was saying that the error occured whilst it was trying to compile 'content_folder__unregister_cont'.
The reson I say this is that I am currently porting the wp-slim package. And the package uses the acs-content-repository, of which content_folder is part of. The area where this error occurs tries to call the content_folder function.
I really am not sure. Any ideas?
jack
