You cannot open the application “Picasa.app”

Hi friends,
Recently I installed Picasa free download version in the computer. The installation went pretty well and good without any problem. The problem triggered when I open, it throws me an error message saying that it ‘is not supported on this system’. I have the basic requirements in the computer. What might me the problem? Help please. Thanks in advance.

You cannot open the application “Picasa.app” because it is not supported on this system.
