Katago on Linux, CUDA backend, throws StringError exception

[emogenet]

KataGo v1.15.3
Using TrompTaylor rules initially, unless GTP/GUI overrides this
terminate called after throwing an instance of 'StringError'
what(): CUDA Error, for createComputeHandle file /home/emogenet/Desktop/KataGo/cpp/neuralnet/cudabackend.cpp, func cudaSetDevice(gpuIdxForThisThread), line 2405, error unknown error
Aborted (core dumped)

[yehu3d]

maybe you have 1 gpu but you set use 2 gpus

[emogenet]

maybe you have 1 gpu but you set use 2 gpus

No, I am on a system with Intel i915 + NVidia GeForce RTX2050

I debugged katago, and it looks like that cryptic message is Katago can't find a proper CUDA device, even though I can run a 3B LLM on it.