Examples are not running

Hello, i have a problem, if i install the package in a new project, everything is working fine, but in my game project not even the examples works, i got this errors in the Example3_recast_Navmesh1/RecastExample:

NullReferenceException: No AstarPath object found in the scene. Make sure there is one or do not create paths in Awake
Pathfinding.Path.Reset () (at Library/PackageCache/com.arongranberg.astar@4.3.35/Core/Path.cs:635)
Pathfinding.ABPath.Reset () (at Library/PackageCache/com.arongranberg.astar@4.3.35/Pathfinders/ABPath.cs:213)
Pathfinding.Path.Pathfinding.IPathInternals.Reset () (at Library/PackageCache/com.arongranberg.astar@4.3.35/Core/Path.cs:901)
Pathfinding.PathPool.GetPath[T] () (at Library/PackageCache/com.arongranberg.astar@4.3.35/Core/Misc/PathPool.cs:82)

There are no graphs in the scene
0x00007FF66C9E31EC (Unity) StackWalker::GetCurrentCallstack
0x00007FF66C9E7211 (Unity) StackWalker::ShowCallstack
0x00007FF66DC5C995 (Unity) GetStacktrace
0x00007FF66EB040EE (Unity) DebugStringToFile
0x00007FF66CA77475 (Unity) DebugLogHandler_CUSTOM_Internal_Log
0x000001EA43A0306B (Mono JIT Code) (wrapper managed-to-native) UnityEngine.DebugLogHandler:Internal_Log

im in Unity 2019.4.12f1, A* version: 4.2.15, and also happend in 4.3


I’m not sure what could cause this since I don’t know how your project is set up. Something seems to be destroying the AstarPath object in the scene.