Hello, i have a fix for all indie developers frustrated with the red devil leters (navmesh needs to be rebuilt).
- go to square box with plus sign
- hit place actor panel
- search for navmeshboundsvolume
- then, cover all playable area in that bounded box
- then, go to build
- scroll down to navigation
- and hit build paths.
it fixed it for me. you also may need to go to project settings, under engine/navigation mesh, scroll down to runtime, and enable rebuild on load level.
hope this helps someone . took my dumb butt all day to get it hahahaha