Navmesh doesn't work, "can be main nav data" keeps getting turned off

[MelvinTang_Games]

I’ve just found out the solution.

1. Close your game project
2. Open your game directory > config
3. Open defaultengine.ini
4. Find for bCanBeMainNavData=False
5. Set it to true

I had the problem in the past few days and I managed to figured it out.