This error means either that NVIDIA CUDA toolkit is not installed on your computer, that the wrong version is installed or that you need to restart your computer. The ZED SDK uses NVIDIA CUDA toolkit to speed up its stereo matching and depth computation algorithms. To fix this error:
1. Visit the download page for CUDA (Windows and Linux).
2. Download and install the appropriate 64-bit version of CUDA depending on your platform.
3. Reboot your computer.
4. Try running your application again.