App crash with our error with Core Data

I am trying to get an App with Core Data to work, but am running in all kinds of problems. At the moment the App seems to crash on different placed in the code without giving an error.

Eg. the last thing on the console is: 2

010-12-21 16:33:51.295 iDoms[9189:207] CoreData: sql: SELECT 0, t0.Z_PK, t0.Z_OPT, t0.ZDESCRIPTION, t0.ZRSS, t0.ZTYPE, t0.ZID, t0.ZNAME, t0.ZACTIVE, t0.ZLASTUPDATE, t0.ZLANGUAGE FROM ZSITE t0 WHERE t0.ZID = ? ORDER BY t0.ZNAME DESC LIMIT 1 2010-12-21 16:33:51.296 iDoms[开发者_运维百科9189:207] CoreData: annotation: sql connection fetch time: 0.0011s 2010-12-21 16:33:51.297 iDoms[9189:207] CoreData: annotation: total fetch execution time: 0.0018s for 1 rows.

HOw can I go about finding out what the problem is? Any help is really appreciated. I am new to Core Data, and have spend a good few hours to find this problem without any luck.

Update: After a bit of debugging I found the following:

Program received signal: “EXC_BAD_ACCESS”. warning: Cancelling call - objc code on the current thread's stack makes this unsafe.

It turns out that there was a problem with a lot of memory leaks in the RSS parser I used. I rewrote it with much simpler code and it made the whole application much more stable.