Unable to find manifest signing certificate in the certificate store

I built my application on one machine and tried ClickOnce. When I synch the project on another dev machine and try to build. I got the error message:
"Unable to find manifest signing certificate in the certificate store".

If I can find a way to resolve this that would be great. Otherwise I would like to konw how I can revert my application building back to the original status without ClickOnce signing involved so I can build the application on another dev machine. This is not a problem before I used ClickOnce on the 1st Dev machine.

Any help?

Thanks!
Jerry