close button action method not working crash when i click the button.

[nam6i]

I have used your code same as it but it crashed when i click the close button.
[closeBtn addTarget:self action:@selector(closePopupWindow) forControlEvents:UIControlEventTouchUpInside];

i didn't change the closePopupWindow method

-(void)closePopupWindow
{
//remove the shade
[[bigPanelView viewWithTag: kShadeViewTag] removeFromSuperview];
[self performSelector:@selector(closePopupWindowAnimate) withObject:nil afterDelay:0.1];

}

but it works when i call the function like
[self closePopupWindow];

error:
[__NSCFArray closePopupWindow]: unrecognized selector sent to instance llb

please give me the suggestions where i went wrong