NvAPI_GPU_SetScanoutWarping has NVAPI_INVALID_ARGUMENT error

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Hello.

I’ve tested NVAPI warping and blending with Quadro M2000.
I downloaded latest NVAPI and Warp and Blend sample from https://developer.nvidia.com/warp-and-blend
But, NvAPI_GPU_SetScanoutWarping returns NVAPI_INVALID_ARGUMENT error.
I checked every parameters, but I have no ideal what’s wrong.

Here’s code.

NV_SCANOUT_WARPING_DATA warpingData;
warpingData.version = NV_SCANOUT_WARPING_VER;
warpingData.numVertices = 4;
warpingData.vertexFormat = NV_GPU_WARPING_VERTICE_FORMAT_TRIANGLESTRIP_XYUVRQ;
warpingData.textureRect = &rt_os;
warpingData.vertices = vertices;

error = NvAPI_GPU_SetScanoutWarping(display_ids[idx].displayId, &warpingData, &maxNumVertices, &sticky);

error has NVAPI_INVALID_ARGUMENT !!