I created a .openspan package in visual studio and specified place holder values in a config file such that I can replace those tokens with environmentally specific values during deployment. In order to accomplish this, my deployment script unzips the .openspan package, modifies a config file, and then rezips the .openspan file with the new config file. When running, I get an error message that states Unable to verify package signature. Reason : InvalidSignature.

Any ideas what could be wrong?