ZOTERO can't start on Firefox 3, MAC OS X (10.5.4)

Every time I'll try to launch Zotero it returns "es gab einen fehler beim starten von zotero". The Debugger returns: Fehler: [Exception... "Component returned failure code: 0x8052000e (NS_ERROR_FILE_IS_LOCKED) [mozIStorageService.openDatabase]" nsresult: "0x8052000e (NS_ERROR_FILE_IS_LOCKED)" location: "JS frame :: chrome://zotero/content/xpcom/db.js :: anonymous :: line 799" data: no]
Quelldatei: chrome://zotero/content/xpcom/zotero.js
Zeile: 220

What can I do? Yesterday I installed this Citation Style: "https://www-user.tu-chemnitz.de/~schfab/?p=24". Could this be caused by it?

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