I commented out a method , yet Xcode still remembers it and is giving me an error

I commented out a method , yet Xcode still remembers it and is giving me
an error

Here is the error message I am getting:
2013-09-19 07:02:39.405 SimpleTable[26665:c07] -[test1ViewController
tableView:numberOfRowsInSection:]: unrecognized selector sent to instance
0x8a3e300
However, I commented out 'numberOfRowsInSection'... why is xcode still
remembering it?
I tried to look through documentation but could not find any thing...
I cleaned the project I clicked on 'build'
still same problem.