xcode - Objective-C program falling on scrolling UITableView -

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hi made application has tableview, works fine starts falling when scroll it.it scroll 5-10 percent of content, if use on table whit 200 data scroll 10-20 whit larger data shows larger data falls.can u me why?or have find problem? thanks

the error message:

2011-02-09 13:23:13.631 navtest[2277:207] *** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '*** -[nscfstring appendstring:]: nil argument' *** call stack @ first throw: (     0   corefoundation                      0x00fa0be9 __exceptionpreprocess + 185     1   libobjc.a.dylib                     0x010f55c2 objc_exception_throw + 47     2   corefoundation                      0x00f59628 +[nsexception raise:format:arguments:] + 136     3   corefoundation                      0x00f5959a +[nsexception raise:format:] + 58     4   foundation                          0x000bf406 mutateerror + 156     5   navtest                             0x0000c13a -[tretiviewcontroller configurecell:atindexpath:] + 487     6   navtest                             0x0000cb22 -[tretiviewcontroller tableview:cellforrowatindexpath:] + 191     7   uikit                               0x003467fa -[uitableview(uitableviewinternal) _createpreparedcellforglobalrow:withindexpath:] + 634     8   uikit                               0x0033c77f -[uitableview(uitableviewinternal) _createpreparedcellforglobalrow:] + 75     9   uikit                               0x00351450 -[uitableview(_uitableviewprivate) _updatevisiblecellsnow:] + 1561     10  uikit                               0x00349538 -[uitableview layoutsubviews] + 242     11  quartzcore                          0x01e5e451 -[calayer layoutsublayers] + 181     12  quartzcore                          0x01e5e17c calayerlayoutifneeded + 220     13  quartzcore                          0x01e5737c _zn2ca7context18commit_transactionepns_11transactione + 310     14  quartzcore                          0x01e570d0 _zn2ca11transaction6commitev + 292     15  quartzcore                          0x01e877d5 _zn2ca11transaction17observer_callbackep19__cfrunloopobservermpv + 99     16  corefoundation                      0x00f81fbb __cfrunloop_is_calling_out_to_an_observer_callback_function__ + 27     17  corefoundation                      0x00f170e7 __cfrunloopdoobservers + 295     18  corefoundation                      0x00edfbd7 __cfrunlooprun + 1575     19  corefoundation                      0x00edf240 cfrunlooprunspecific + 208     20  corefoundation                      0x00edf161 cfrunloopruninmode + 97     21  graphicsservices                    0x018d5268 gseventrunmodal + 217     22  graphicsservices                    0x018d532d gseventrun + 115     23  uikit                               0x002e142e uiapplicationmain + 1160     24  navtest                             0x0000257c main + 102     25  navtest                             0x0000250d start + 53 ) terminate called after throwing instance of 'nsexception'

the application crashes @ [nscfstring appendstring:]: nil.just go through code,where using appendstring function.in point,you getting nil,hence application crashing.you can debug code,i hope solution.


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