Sunbird: Corrupt Data?

I'm using Sunbird portable version 0.3
A few days ago SB worked just fine, untill today.

I opened SB and.. there were no events. So I checked up on the calenders. No calender was loaded. But, when i click "Export Calender" it shows me all of my calender files I normally use. I can't export the calenders though.

I have the minimize to tray extension, but after disable the extension it didn't bring my events back.

Errors:

-----------------------
Error: [Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [mozIStorageStatementWrapper.step]" nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "JS frame :: file:///E:/SunbirdPortable/App/sunbird/components/calStorageCalendar.js :: anonymous :: line 1438" data: no]
Source File: file:///E:/SunbirdPortable/App/sunbird/components/calStorageCalendar.js
Line: 1438
------------------------
Error: gCalendarWindow has no properties
Source File: chrome://calendar/content/calendar.xul
Line: 1
-----------------------

I tried to replace the calStorageCalender.js, but it didn't fix the problem..

Can somebody help me with my problem please?

Greetz,

Dunno