You should also consider message "Exception: no supported GPGPU APIs found", which seems to be indicative of an API call meant for a non-supported GPU. For a list of supported GPUs, you may have a look at the "GPUs on Compute Engine" documentation
page.
This discussion group is oriented more towards general opinions, trends, and issues of general nature touching the app engine. For coding and programming architecture, as well as dealing with various APIs, you may be better served in dedicated forums such as stackoverflow, where experienced programmers are within reach and ready to help.