'Coloring source file' has encountered a problem

Hello,

I'm trying to follow the getting started instructions with distance2go and have got as far as trying to run debug on the example project in Dave. There are no build errors or problems reported, but when debugging is started a popup appears:
Title:
Problem Occurred

Message:
'Coloring source file' has encountered a problem.
An internal error has occurred

Details:
An internal error has occurred.
assertion failed:

Clicking on OK leaves the program paused on the entry to main (as expected on starting debug), but the popup returns if I click on continue

This is my first time trying to get both Dave and distance2go working, so I may have got something simple wrong. I have repeated the installation with the same results, and updated both Dave and the APPs, again with the same results.

Any advice in fixing this would be great.
Thanks