When I start Using New Terrain Tool Brush I got an error

This is the error can someone please solve this
RenderTexture.Create failed: format unsupported for random writes - R16 SFloat (45).
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

Hi there, I bump this question, terrain drives me crazy totally useless, unable to paint, same problem.anyone from unity can help on that?? Thank you