Assertion Failure in Interface Builder

Question

I am again and again getting Assertion Failure message in Interface Builder.

Can anyone help me to resolve it?

Below is the backtrace report:

Assertion Message: I've already been indexed!

Backtrace:
  0. Interface Builder        0x00004d29 [IBApplication handleAssertion:inFile:onLine:]
  1. InterfaceBuilderKit      0x002f3bcc [IBHitDetectionMap addRepresentedObjectRect:representedObject:forOrderingKey:]
  2. InterfaceBuilderKit      0x0031ad1f [IBEditableWindow _addCursorRect:cursor:forView:]
  3. AppKit                   0x959907bc [NSView addCursorRect:cursor:]
  4. AppKit                   0x9598f576 [NSSplitView resetCursorRects]
  5. AppKit                   0x9598e19d [NSView _updateTrackingAreas]
  6. CoreFoundation           0x9284a676 CFArrayApplyFunction
  7. AppKit                   0x9598e4df [NSView _updateTrackingAreas]
  8. CoreFoundation           0x9284a676 CFArrayApplyFunction
  9. AppKit                   0x9598e4df [NSView _updateTrackingAreas]
 10. CoreFoundation           0x9284a676 CFArrayApplyFunction
 11. AppKit                   0x9598e4df [NSView _updateTrackingAreas]
 12. CoreFoundation           0x9284a676 CFArrayApplyFunction
 13. AppKit                   0x9598e4df [NSView _updateTrackingAreas]
 14. CoreFoundation           0x9284a676 CFArrayApplyFunction
 15. AppKit                   0x9598e4df [NSView _updateTrackingAreas]
 16. AppKit                   0x9598de72 [NSSurface syncToView:]
 17. CoreFoundation           0x928b9772 CFRunLoopObserverInvalidate
 18. CoreFoundation           0x928baacc CFRunLoopRunSpecific
 19. CoreFoundation           0x928bbaa8 CFRunLoopRunInMode
 20. HIToolbox                0x90b282ac BlockUntilNextEventMatchingListInMode
 21. HIToolbox                0x90b27ffe BlockUntilNextEventMatchingListInMode
 22. HIToolbox                0x90b27f39 BlockUntilNextEventMatchingListInMode
 23. AppKit                   0x959026d5 _DPSNextEvent
 24. AppKit                   0x95901f88 [NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:]
 25. Interface Builder        0x0000276b [IBApplication nextEventMatchingMask:untilDate:inMode:dequeue:]
 26. AppKit                   0x958faf9f [NSApplication run]
 27. AppKit                   0x958c81d8 NSApplicationMain
 28. Interface Builder        0x00004eca [IBApplication changeInspectorMode:]

Thanks,

Miraaj