Operating system and graphics card
Win 7 64 Bit
Broken: (example: 2.69.7 4b206af, see splash screen)
Current Blender Master fails.
Blender 2.79a works fine.
Short description of error
Bool Tool throws error message.
Exact steps for others to reproduce the error
Based on a (as simple as possible) attached .blend file with minimum amount of steps
Open Blender, duplicate the cube. Move it a bit. Now activate the Bool Tool Addon, which is part of Blender addons. Select both cubes with holding shift, then try to use the bool tool Difference.
This one is most probably a problem in the source code somewhere. I have used the addon version from the 2.79a folder too, which differs from the one in the master when you update the submodules. And the problem is still there.