Running into memory issues when using cv::cuda::sum

I want calculate run `cv::sum` on the GPU - so I looked to `cv::cuda::sum`. However, I'm running into issues. This github gist has all the details. I've launched https://gist.github.com/liquidmetal/95f5cdc62c83121245d9 Any help on how to fix this would be appreciated. I suspect I may be doing something wrong.