Problem Adding/Editing/Removing Events


I’ve just installed Scheduler v30.120425 on Joomla 2.5. But I have a Problem with Adding Events. Every Time i want to add/delete or remove a event i get the error

Incorrect incoming data, ID of incoming records not recognized, i’ve attached a screenshot of the error.

Any ideas?

Best regards,

do you use any specific extensions or redirection rules?