Need Help! Debug Assertion Failed

When trying to use Unity for VRChat models I ran into an unfamiliar issue while importing the SDK. No one else seems to have this issue, but I linked a picture below. I have tried:

  • reinstalling both Unity and the SDK
  • deleting all associated files and folders for Unity then reinstalling
  • starting a new project
  • using different versions of the SDK
  • dragging the SDK in as well as right clicking then importing
  • following every video guide to the T

Both the UnwrapCL.exe had issues as well as the fwrite.c from what the message said.
Nothing has seemed to work and I really want to use it. Any help would be appreciated.

I am running Unity v5.6.3p1 and VRCSDK-2018.01.26.13.13 Public


Not a fan of visual studio myself so I am not sure if it has been fixed since or not but I do remember a time that the visual studio you could install with Unity had lots of issues, but the standalone from microsoft worked fine. You might wish to give that a whirl if you are using the visual studio you can install with the unity installer. Worth a shot.

I have tried downloading visual studio from the Microsoft website and still had the same issue. Is there a particular version I need to use? If so, then how do I make Unity use the particular version and not the newest one? Is there something other than visual studio that you use to import files like the SDK?