Zotero warning with my style - why?

To design a new style I started with an existing one. Things seem to be going well, the style seems to work fine, but when I load it into Zotero I get an error message, that it isn't a valid style. The message in German reads:

"muwi-test-2.6.csl" ist keine gültige CSL 1.0.1 Zitationsstil-Datei, daher funktioniert sie möglicherweise nicht korrekt mit Zotero.

As I said, I haven't had any problems yet, but I am worried. What could this be?
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