InfoPath Dev

I am still struggling about the Security level. The form Security level selected: Domain, No signed certificate. After published the form to a network location. I can open the published form and populate data. But all of my co-workers in the same domain cannot open the form. The error message popup: 

The form cannot be opened because either the signature is corrupt, or the certificate used to sign the form has expired or been revoked.

Any one has any suggestion?

Thank you!

Try removing the form from your user's cache. On your user's machine, close all InfoPath forms. Go to Windows Start and launch InfoPath Filler (or InfoPath for 2007). Find the form template and click remove. Close InfoPath. Now try to reopen your form.

Thanks Patrick,

You are right!

Thank you!