"Variable 'test' was not loaded because driver with ID '101' is unknown!" message

"Variable 'test' was not loaded because driver with ID '101' is unknown!" message

Hello, colleagues!
After many steps of changing my project error message starts to appear.
It happens during activate of project in V460 editor.
Error message has text "Variable 'test' was not loaded because driver with ID '101' is unknown!" and comes in Output Window after "Load project" message.
Is there any way to fix such message or nothing wrong is happened and I can be patient?

This is a migrated post! Originally posted on 17.01.2014 by user stolyarov_as. Please be aware that information can be outdated.