Warning on clone in new unity 3D project

[hbonnavaud]

When I clone the repository in my unity 3D project, I get this warning:
"A meta data file (.meta) exists but its asset 'Assets/TerrainGenerator/Images/HydraulicErosionSettings.PNG' can't be found. When moving or deleting files outside of Unity, please ensure that the corresponding .meta file is moved or deleted along with it."
The file "TerrainGenerator/Images/HydraulicErosionSettings.PNG" do not seems to exists in the repository itself.