I have created a node type which I want to use to store events in. I can create new nodes of this type with no problems, but when I want to edit and save a existing node, I get this error:
In english, this means "Unknown field:". However, a field with this name isn't even defined in my node type:
Full size image here: http://d.pr/i/8V36
Do you have any idea what could cause this error?