This is because your GPU does not have enough memory to run basecalling. Please see the CPU/GPU basecalling usage section on how to estimate the amount of memory to use.

When in doubt, setting:

`--num_callers 1

--gpu_runners_per_device 1

--chunks_per_runner 1`

Should it result in very low GPU memory use (and correspondingly low basecalling speed), you can experiment with increasing those numbers until running out of GPU memory again.