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Do you have any non-ascii characters in the editor css files? It's not allowed to have for instance swedish characters in the editmenuname attribute values. If this is required you should use the translation support for style names instead.
Thanks for the reply!
I downloaded another version of the project and started anew from that and then it worked. Since I hadn't received your reply, I didn't check if the css-file contained any non-ascii-characters. Thanks for the information!
Have a great day!