2030926728 error id

Hi i always get this error i send to you, and syncing is not working realy working, it stops after some time, i have firefo 3.01 installed, newest sync, 3 gig free space...and no other extensions, but more than 200 mb of files if i use the export function of zotero.
any help?

i realy need this syncing feature, tried it before with foldershare, but this was not working properly



[JavaScript Error: "[Exception... "Component returned failure code: 0x80520015 (NS_ERROR_FILE_ACCESS_DENIED) [nsIFile.remove]" nsresult: "0x80520015 (NS_ERROR_FILE_ACCESS_DENIED)" location: "JS frame :: chrome://zotero/content/xpcom/storage.js :: anonymous :: line 1240" data: no]" {file: "chrome://zotero/content/xpcom/storage.js" line: 1240}]

[JavaScript Error: "[Exception... "Component returned failure code: 0x80520015 (NS_ERROR_FILE_ACCESS_DENIED) [nsIFile.remove]" nsresult: "0x80520015 (NS_ERROR_FILE_ACCESS_DENIED)" location: "JS frame :: chrome://zotero/content/xpcom/storage.js :: anonymous :: line 1240" data: no]" {file: "chrome://zotero/content/xpcom/storage.js" line: 1240}]

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