No valid digital signature found

[DavidBailey]

I'm using version 7 of Visual Build Pro and I quite often get an error that:

"No valid digital signature found" and the build stops.

The error occurs on any step including copying files, building visual studio solution files and even groups.

It does not always occur and it will occur on different steps. To get around the error I shut down visual build pro, restart and try to do the build again. Quite often the error will occur on a different step even after a restart.

I'm looking for anyone that might have experienced this problem and can recommend a way to resolve it.