来自相关资料1

（使用的模型是 Unity 的AssetStore 的simple town lite- cartoon assets）

RuntimeNavMeshBuilder: Source mesh road_straight_mesh does not allow read access. This will work in playmode in the editor but not in player
UnityEngine.AI.NavMeshBuilder:UpdateNavMeshDataAsync(NavMeshData, NavMeshBuildSettings, List`1, Bounds)
LocalNavMeshBuilder:UpdateNavMesh(Boolean) (at Assets/Examples/Scripts/LocalNavMeshBuilder.cs:54)
<Start>c__Iterator0:MoveNext() (at Assets/Examples/Scripts/LocalNavMeshBuilder.cs:26)
UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr)

找到 道路 的预制体，并找到 模型 的Mesh 材质

如下图所示的， Read/Write Enabled 进行勾选，进行应用

相关资料：

1. 

[Unity][NavMesh]Unity NavMesh Compent 寻路组件动态自动烘培

2.

[Unity][NavMesh]Unity NavMesh Compent 寻路组件动态自动烘培更新2018

3.