Problem with Ribbit App Succeeding, but terminating before Log In Screen

Hi Treehouse mates,

I've got a big moth of a bug that I can't figure out. I get this when I run my app:

2014-10-20 17:25:04.824 Ribbit[92742:19867455] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Cannot do a comparison query for type: (null)' *** First throw call stack: ( 0 CoreFoundation 0x0000000111ca1f35 exceptionPreprocess + 165 1 libobjc.A.dylib 0x000000011193abb7 objc_exception_throw + 45 2 CoreFoundation 0x0000000111ca1e6d +[NSException raise:format:] + 205 3 Ribbit 0x000000010eb4a0b1 +[PFInternalUtils assertValidClassForQuery:] + 333 4 Ribbit 0x000000010eb333f9 -[PFQuery whereKey:equalTo:] + 86 5 Ribbit 0x000000010eb1c7a0 -[InboxTableViewController viewWillAppear:] + 336 6 UIKit 0x000000011030c821 -[UIViewController _setViewAppearState:isAnimating:] + 487 7 UIKit 0x0000000110337960 -[UINavigationController _startTransition:fromViewController:toViewController:] + 776 8 UIKit 0x0000000110338487 -[UINavigationController _startDeferredTransitionIfNeeded:] + 523 9 UIKit 0x0000000110338f47 -[UINavigationController __viewWillLayoutSubviews] + 43 10 UIKit 0x000000011047e509 -[UILayoutContainerView layoutSubviews] + 202 11 UIKit 0x000000011025c973 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 521 12 QuartzCore 0x000000010fcadde8 -[CALayer layoutSublayers] + 150 13 QuartzCore 0x000000010fca2a0e _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 380 14 QuartzCore 0x000000010fca287e _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24 15 QuartzCore 0x000000010fc1063e _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 242 16 QuartzCore 0x000000010fc1174a _ZN2CA11Transaction6commitEv + 390 17 UIKit 0x00000001101e154d -[UIApplication _reportMainSceneUpdateFinished:] + 44 18 UIKit 0x00000001101e2238 -[UIApplication _runWithMainScene:transitionContext:completion:] + 2642 19 UIKit 0x00000001101e0bf2 -[UIApplication workspaceDidEndTransaction:] + 179 20 FrontBoardServices 0x00000001154972a3 __31-[FBSSerialQueue performAsync:]_block_invoke + 16 21 CoreFoundation 0x0000000111bd753c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK + 12 22 CoreFoundation 0x0000000111bcd285 __CFRunLoopDoBlocks + 341 23 CoreFoundation 0x0000000111bcca43 __CFRunLoopRun + 851 24 CoreFoundation 0x0000000111bcc486 CFRunLoopRunSpecific + 470 25 UIKit 0x00000001101e0669 -[UIApplication _run] + 413 26 UIKit 0x00000001101e3420 UIApplicationMain + 1282 27 Ribbit 0x000000010eb1e163 main + 115 28 libdyld.dylib 0x0000000113caa145 start + 1 29 ??? 0x0000000000000001 0x0 + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException

I was in the process of updating the designs (the heavy lifting is all done), but then when I was doing a build it stopped working. One funny clue is that it still works on my actual iphone (my hypothesis is that that's because I haven't logged out) everything else seems to crash when it gets to the login page. It's driving me nuts.

Pretty sure this is Parse related. Here's a relevant parse question that I could use interpretation on: https://www.parse.com/questions/ios-most-elegant-way-to-catch-assertvalidclassforquery-problems

Thanks!