How can I avoid Terminating the app


In the book I’m up to page 304 and when it tells me to build and run my app I have no errors. Then when I run my app I get a
2014-05-05 12:56:39.536 Homepwner[1558:907] *** Assertion failure in -[UITableView _configureCellForDisplay:forIndexPath:], /SourceCache/UIKit_Sim/UIKit-2380.17/UITableView.m:5471
2014-05-05 12:56:39.538 Homepwner[1558:907] *** Terminating app due to uncaught exception ‘NSInternalInconsistencyException’, reason: ‘UITableView dataSource must return a cell from tableView:cellForRowAtIndexPath:’
*** First throw call stack:
(0x1c9d012 0x10dae7e 0x1c9ce78 0xb70665 0xd4c1b 0x6940c 0xd4a7b 0xd9919 0xd99cf 0xc21bb 0xd2b4b 0x6f2dd 0x10ee6b0 0x2299fc0 0x228e33c 0x2299eaf 0x10e2bd 0x56b56 0x5566f 0x55589 0x547e4 0x5461e 0x553d9 0x582d2 0x10299c 0x4f574 0x4f76f 0x4f905 0x58917 0x203f 0x1c157 0x1c747 0x1d94b 0x2ecb5 0x2fbeb 0x21698 0x1bf8df9 0x1bf8ad0 0x1c12bf5 0x1c12962 0x1c43bb6 0x1c42f44 0x1c42e1b 0x1d17a 0x1effc 0x1c6d 0x1b95 0x1)
libc++abi.dylib: terminate called throwing an exception
In the Output what am I doing wrong??
also when i try and open the app on the iPhone it comes up blank and it wasn’t blank before.