smushit is giving me error when I try to run "Run all my images through WP Smush.it right now&q

Hi;
I downloaded the smushit to compress my images but when I pressed the button, "Run all my images through WP Smush.it right now" then I got this error message

Error 324 (net::ERR_EMPTY_RESPONSE): The server closed the connection without sending any data

Please help me.
Thanks
Bobby