EXC_BAD_ACCESS on lauching, random bug

I've nearly finished my first App but i'm getting a weird EXC_BAD_ACCESS that nearly happens all the time.

Here is the trace :

#0 0x02adba93 in objc_msgSend
#1 0x07022e00 in ??
#2 0x028bcbcd in _CFAutoreleasePoolPop
#3 0x0003999f in -[NSAutoreleasePool release]
#4 0x002e9f84 in _UIApplicationHandleEvent
#5 0x0310dafa in PurpleEventCallback
#6 0x02961dc4 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__
#7 0x028c2737 in __CFRunLoopDoSource1
#8 0x028bf9c3 in __CFRunLoopRun
#9 0x028bf280 in CFRunLoopRunSpecific
#10 0x028bf1a1 in CFRunLoopRunInMode
#11 0x002e2226 in -[UIApplication开发者_如何学Python _run]
#12 0x002edb58 in UIApplicationMain
#13 0x0000282e in main at main.m:14

The weird thing is that some times the App start normally, so i really don't understant what's going on and some help would be great :)

You've over-released an object, so when the autorelease pool gets cleared, it's an invalid operation.

Debug it with zombies:

• Double-click your executable executable http://cl.ly/180aaa2cf72e9ce55717/content
• Select Arguments and add NSZombieEnabled with value YES zombies! http://cl.ly/70cd173026d600545d3b/content

Then run your app again, and check the console — it should tell you what object is being over-released.