Beta - WebGL throws errors about not being able to tick pathfinding

[Hertzole]

When using the latest version of the beta 4.3.84 in a web GL build, I get a bunch of errors in the web console that says “Cannot tick non-multithreaded pathfinding when no coroutine has been started”. This never appears in the editor.

When reproducing this issue I created a new project and just built Example3_Recast_Navmesh1, the agent was still able to navigate but the error kept getting thrown. However, in my project, where I first noticed this issue, my agents could not navigate. I believe fixing this issue fixes my agent’s navigation issue too.

If there’s anything else I can provide, I’ll be happy to!

[aron_granberg]

Thanks! A fix will be included in the next beta update.
The code was relying on ManualResetEvents in one case, which are not functional at all in WebGL.

[Hertzole]

Awesome, thank you! Any idea when the next beta version might be released? I really want to try my game in WebGL and this is a real show stopper right now.

[aron_granberg]

Probably some time this week.

[renza]

We are also very much waiting for this error to be fixed

[combine_soldier]

I’m facing the same error, i hope the next update with a fix will be released soon

[aron_granberg]

Hi

Sorry, some refactoring is taking longer than expected. But I’m working as hard as I can to get it out quickly.

[aron_granberg]

The new beta is available now! Sorry for taking so long.

[tobario]

Hi, I still have that problem, which completely breaks my game. I have updated a*pp to version 5.1.6. Still the same. Is there a workaround that I can use to prevent this error?

I’m using a game object based point graph.

[aron_granberg]

Hi

Do you have a test project with which I could replicate this issue reliably?

[tobario]

Unfortunately not. My game is several gigabytes in size. But it happens when I open a door and set nodes to walkable or activate NodeLinks and then scan in WebGL. In x64 everything works as intended. My Unity version is 2022.3.40f1.

                if (_pathfindingNode.graphNode != null)
                {
                    _pathfindingNode.graphNode.Walkable = true;
                    _pathfindingNode.graphNode.GetConnections(con => con.Walkable = true);
                }```

            if (AstarPath.active != null && !AstarPath.active.isScanning)
                AstarPath.active.Scan();

Following Error appears. The interesting thing is: It doesnt happen everytime. It seems to happen after 4 or 5 times quite consistently. So I thought it might have to do with the number of jobs in astar. But no matter how many jobs I setup, its always the same outcome:

IndexOutOfRangeException: Index was outside the bounds of the array.
Pathfinding.GlobalNodeStorage.GetNode (System.UInt32 nodeIndex) (at ./Library/PackageCache/com.arongranberg.astar@5.1.6/Core/Pathfinding/GlobalNodeStorage.cs:57)
Pathfinding.PathHandler.GetNode (System.UInt32 nodeIndex) (at ./Library/PackageCache/com.arongranberg.astar@5.1.6/Core/Pathfinding/PathHandler.cs:278)
Pathfinding.Path.CalculateStep (System.Int64 targetTick) (at ./Library/PackageCache/com.arongranberg.astar@5.1.6/Core/Pathfinding/Path.cs:1077)
Pathfinding.Path.Pathfinding.IPathInternals.CalculateStep (System.Int64 targetTick) (at ./Library/PackageCache/com.arongranberg.astar@5.1.6/Core/Pathfinding/Path.cs:1131)
Pathfinding.PathProcessor+<CalculatePaths>d__36.MoveNext () (at ./Library/PackageCache/com.arongranberg.astar@5.1.6/Core/Pathfinding/PathProcessor.cs:461)
Pathfinding.PathProcessor.TickNonMultithreaded () (at ./Library/PackageCache/com.arongranberg.astar@5.1.6/Core/Pathfinding/PathProcessor.cs:216)
UnityEngine.Debug:LogException(Exception)
Pathfinding.PathProcessor:TickNonMultithreaded() (at ./Library/PackageCache/com.arongranberg.astar@5.1.6/Core/Pathfinding/PathProcessor.cs:221)
AstarPath:Update() (at ./Library/PackageCache/com.arongranberg.astar@5.1.6/Core/AstarPath.cs:891)

Unhandled exception during pathfinding. Terminating.
UnityEngine.Debug:LogError (object)
Pathfinding.PathProcessor:TickNonMultithreaded () (at ./Library/PackageCache/com.arongranberg.astar@5.1.6/Core/Pathfinding/PathProcessor.cs:222)
AstarPath:Update () (at ./Library/PackageCache/com.arongranberg.astar@5.1.6/Core/AstarPath.cs:891)

InvalidOperationException: Cannot tick non-multithreaded pathfinding when no coroutine has been started
Pathfinding.PathProcessor.TickNonMultithreaded () (at ./Library/PackageCache/com.arongranberg.astar@5.1.6/Core/Pathfinding/PathProcessor.cs:213)
AstarPath.Update () (at ./Library/PackageCache/com.arongranberg.astar@5.1.6/Core/AstarPath.cs:891)

Maybe the jobs/coroutines are not cleared up automatically after they finished in webgl?

[tobario]

I put in a completely new setup pathfinding component. Now it seems to work.

[Dreambloke]

Hello,

I’m using Pathfinding 5.3.3 and I still have this problem (everything works fine on windows and editor)

I’m using GridGraph instead of recast graph but I think this does not change much about the problem…

[Dreambloke]

It was from data.OnEnable();
I don’t use cache in my project, so i returned early from the OnEnable function and it works fine for me. Please keep me updated once you have a proper fix

[tealtxgr]

Would you mind making a new thread for this one with a link to this thread? I’m hesitant to continue the thread here due to it’s age and I wouldn’t want OP/other participants getting notifications from it.