Hello Grimeh,
I have a few questions for you to gather some more information and try to cover all the bases.
- Have you successfully generated project files for 4.9 previously?
- Can you try downloading the source for a version you previously had no issues with to see if the problem persists there?
- What version of Visual Studio are you using and have you updated / added any extensions/add-ons recently?
- What version of windows are you using and have you upgraded recently?