cuda code error

thrust

[thrust::system::system_error]

cudaMalloc((void**)&nanFlags_dev, N*sizeof(int));
getNANpts << <fullBlocksPerGrid, blockSize >> >(N, z_dev, nanFlags_dev);
cudaDeviceSynchronize();
thrust::device_ptr<int> thrust_nanflags(nanFlags_dev);
//int num_of_nan = thrust::reduce(thrust_nanflags, thrust_nanflags + N, (int)0, thrust::plus <int >());  //统计有多少个NAN点
int num_of_nan = thrust::count(thrust_nanflags, thrust_nanflags + N, 1);  //统计有多少个NAN点
cudaDeviceSynchronize();