Change "Convert mr Sun / Sky to V-Ray Sun / Sky" in V-Ray Scene Converter to "Convert 3ds Max's Physical Sun/Sky".
Mental ray hasn't been used for a long time and 3ds Max's Physical Sun Sky is not supported on V-Ray GPUs, so it needs to be converted.
Mental ray hasn't been used for a long time and 3ds Max's Physical Sun Sky is not supported on V-Ray GPUs, so it needs to be converted.