This error is NOT really a program error but "user error" instead.
If you read Ninja Monkey's MapMonkey or D3 Front End forum, you will know exactly what the problem and how to fix it.
The first problem. This is NOT a problem with the software or user. This is the notification or nag screen to let the user know this is a BETA version. Get the latest version and it will be gone.
2nd problem is user error for NOT . Although there is no manual to read, but there are forum to read. You have to configure D3 FE to use Advance GPS with correct COM port where GPS signal coming from. If your computer only have 2 COM port, and D3 FE set to use COM 3, that is the error you get.