[__NSCFNumber length]: unrecognized selector sent to instance UITableView

cell.titleLabel.text = txn.funcCdDscp;
cell.totalCountLabel.text = txn.taskCount;

One of these (not sure which, but my guess would be taskCount) is a NSNumber. Text takes an NSString.

cell.titleLabel.text = txn.funcCdDscp;
cell.totalCountLabel.text = [txn.taskCount stringValue];

OR

Use this as this is best solution

cell.totalCountLabel.text = [NSString stringWithFormat:@"%@",txn.taskCount];