I think you have clicked in wrong place. If you clicked then it is possible that not full page open and your page may be closed down. It happens with some people in the world that they click for own and not get anything.
u have selected wrong category, u should start this thread in google > adsense section. however ur ans is, that was invalid click or Public service ads (if u r showing PSA).
They are invalid clicks .It may be from your neighboring IP addresses or you clicked on your ad yourself
I have plently of $0.00 clicks as well as 2 for $0.01 or 3 for $0.02 . I'm afraid it's something we have to live with...
If you get invalid clicks --> build on traffic, build on content, build on traffic, content, traffic, content, traffic, more traffic, content, traffic, content, more content ->repeat the previous step.