Postponed: CUDA device initialisation failed

This error is seen in combination with Couldn't get cuda device count in file '/PATH/cudaAcceleration.cu' in line N: no CUDA-capable device is detected.
This happens when you do have an Nvidia GPU, but it isn't CUDA capable, its driver hasn't loaded correctly or the user running the GPU driver does not have the correct permission to do so.

BOINC suspends the CUDA device initialisation until this is fixed.

Do make sure you have the correct driver. Try different (older or newer) drivers, but make sure you get them from the Nvidia driver download page.