NSInternalInconsistencyException while adding row to UITableView

I have trouble with adding new row to my UITableView. I read similar questions on stackoverflow, googled it, ... didn't help me. I have empty NSMutableArray *dataForList with data for UITableView. After click on screen I want to add new row. This error shows: * Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'attempt to insert row 0 into section 0, but there are only 0 rows in section 0 after the update' Code: ``` NSArray *insertIndexPaths = [NSArray arrayWithObject: [NSIndexPath indexPathForRow: [self.dataForList count] // is zero now inSection:0]]; [self.dataForList addObject:newRow]; // [self.dataForList count] is 1 now [self.unsignedTableView beginUpdates]; [self.unsignedTableView insertRowsAtIndexPaths:insertIndexPaths withRowAnimation:UITableViewRowAnimationNone]; [self.unsignedTableView endUpdates]; // on this line error ocours ``` What am I missing? All UITableView methods ``` - (void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *) indexPath {} - (NSInteger) numberOfSectionsInTableView:(UITableView *)tableView { return 1; } - (NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger) section { return [self.mainController.dataForList count]; } - (CGFloat) tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *) indexPath{ return 38.0f; } - (UITableViewCell *) tableView: (UITableView *) tableView cellForRowAtIndexPath: (NSIndexPath *) indexPath { // call render method in view, it works fain return [self.signUpToTestView renderUnsignedCell:tableView cellForRowAtIndexPath:indexPath]; } ```