NAVMESH needs to be rebuilt

[walemmlis]

Hello,

I’m using UE5.0. A NavMeshBoundsVolume is used in my design for AI controlled NPC.
But, there is always an error report ‘NAVMESH needs to be rebuilt’ once I started PIE.

I explored the post with similar question in this forum and tried the solutions proposed as illustrated below. But, no one is working.

[SupportiveEntity]

Hey there @walemmlis! Have you tried manually rebuilding the navigation using the command RebuildNavigation? If so, this might be that weirdness with multiplayer since I see your project up there. We could also try checking force rebuild on load in the recast nav mesh, but if you have large levels this can get heavy.

Here’s a thread where they allowed client side navigation:

Navmesh needs to be rebuilt UE5 Multiplayer?

I’ve moved my 4.27 project over to UE5 & When I start it in client mode with 2 players, I got an error saying “Navmesh need to be rebuilt”. Even after rebuilding project doesn’t fix it. Seems to be a problem with multiplayer only shows an error for each client that join’s. Nav mesh & AI still work as before tho even with this error? Also tested this in fresh project’s, just third person & first person template’s, 2 player client net mode with a plain nav mesh dropped in, Same error Is there s…

[walemmlis]

@SupportiveEntity , Indeed, after checking ‘Allow Client Side Navigation’ the error is gone. Thanks a lot!

[SlayerGoury]

5.4.4 → 5.6
RebuildNavigation doesn’t seem to have any effect
Changin settings also doesn’t seem to have any effect
Navigation is clearly not working for me

[itsakimmel]

I’m finding myself in the same issue today, outta nowhere my navmesh stopped workin’ and keeps saying needs to be rebuilt. I’m at one helluva loss.

[SupportiveEntity]

Hey there @SlayerGoury and @itsakimmel! Welcome back to the community! Does Navmesh work in non-migrated forward native 5.6 projects?

[Kunal_09]

i was having the same issue after migrating
but turns out my nav mesh and all nav modifiers were in the sub level and recast nav mesh is only created in persistent level
so moving all nav mesh volumes back in persistent level and deleting recast to rebuild it worked for me.

[vucli1]

I was having the same issue in 5.6, and was going mad since nothing seemed to have an effect, no matter what I did or what settings I changed. For some unknown reason, what helped me was that I deleted the existing navmesh - in the persistent level I must add -, made a new level with a cube and navmesh, built it, and there it worked. This surprised me, so I deleted the test level, went back to the original one, added a navmesh, built it, and it started working.

Hope this helps.