Assertion failure in -[UINib initWithNibName:directory:bundle:]

Assertion failure in -[UINib initWithNibName:directory:bundle:]

I get the error with below message when I touched uitextfield in view
controller.
msg: * Assertion failure in -[UINib initWithNibName:directory:bundle:],
/SourceCache/UIKit/UIKit-2380.17/UINib.m:96 2013-08-26 15:58:43.547
Xpointer[1023:907] * Terminating app due to uncaught exception
'NSInternalInconsistencyException', reason: 'Invalid parameter not
satisfying: (name != nil) && ([name length] > 0)'
This error show and always crash everywhere(all view controller).
But I can't fix it.
Help me anyone.