I recovered my project latest file with roads by importing my terrain ".wrp" file into a blank Terrain Builder.
I used the ".wrp" file for offline mode testing so I backed it up in latest form.
If anyone has same problem try this method.

I suspect some file is corrupted which blocks the loading process. I can recover my project by creating a new one and importing heightmap, surface, satellite and the main layer of the project
but the main default layer does not have the roads which I have created with the road tool in Terrain Builder.

Third time this happened. I lost all of my road network which took hundreds of hours to make.

I have recovered my project after TerrainBuilder didn't load it.
I suspect the cause of this was the latest road network I added to the terrain using road tool in TerrainBuilder.

Issue remains but I got Buldozer working after setting the application path to game directory instead of mounted project drive.