Ok I found your problem.
- Go to “Edit” - “Project settings” - “Rendering” And Make sure you have “Generate Mesh Distance Fields” activated in the lighting tab.
- Restart Unreal Engine (if it was not already activated).
- Select your Directional Light, Expand the “Light” Tab by clicking on the down arrow.
- Deactivate " Cast shadows for Cinematic objects only".
And there you go!
