[BUG] Invalid convert color code: 48

[Strinkin]

Describe the bug
my code are follow:
// ######################### begin #########################
int main(int argc, char** argv) {
cudaStream_t stream;
cudaStreamCreate(&stream);

int in_width = 1440;
int in_height = 1080;
int in_channels = 1;
int batch_size = 1;

int nCurValue = in_width * in_height * in_channels;
unsigned char* pData = (unsigned char*)malloc(sizeof(unsigned char) * nCurValue);

std::ifstream infile("/home/strinkin/Pictures/a.raw", std::ios::binary);
infile.read(reinterpret_cast<char*>(pData), nCurValue);

nvcv::Tensor inTensor(batch_size, {in_width, in_height}, nvcv::FMT_Y8_ER);

auto in_data = inTensor.exportData<nvcv::TensorDataStridedCuda>();
cudaMemcpyAsync(in_data->basePtr(), pData, sizeof(uint8_t) * in_width * in_height * in_channels, cudaMemcpyHostToDevice, stream);
cudaStreamSynchronize(stream);

int out_width = 1440;
int out_height = 1080;
int out_channels = 3;

nvcv::Tensor bgrTensor(batch_size, {out_width, out_height}, nvcv::FMT_BGR8);
auto bgr_data = bgrTensor.exportData<nvcv::TensorDataStridedCuda>();

cvcuda::CvtColor cvtOp;
cvtOp(stream, inTensor, bgrTensor, NVCV_COLOR_BayerRG2BGR);

cv::Mat h_image(out_height, out_width, CV_8UC3);

// bgrTensor -> h_image
cudaMemcpyAsync(h_image.ptr(), bgr_data->basePtr(), sizeof(uint8_t) * out_width * out_height * out_channels, cudaMemcpyDeviceToHost, stream);
cudaStreamSynchronize(stream);
cout << h_image << endl;
cout << h_image.rows << " " << h_image.cols << " " << h_image.channels() << endl;

cv::imshow("output", h_image);
cv::waitKey(0); 
cv::destroyAllWindows(); 

cudaStreamDestroy(stream);

}
// ########################## end ############################
// ######################description####################
the function: cvtOp(stream, inTensor, bgrTensor, NVCV_COLOR_BayerRG2BGR);
throw an error:
//############ terrminal output ###################
ERROR: Invalid convert color code: 48
terminate called after throwing an instance of 'nvcv::Exception'
what(): NVCV_ERROR_INVALID_ARGUMENT: :0 (INVALID_PARAMETER)
//############ terrminal output ###################
when i change NVCV_COLOR_BayerRG2BGR to NVCV_COLOR_GRAY2BGR, the error disppear

I'm desperate for a solution，very thankful。