Hi,
In theory if you set num_workers=0, dataloader should run on the main thread. Therefore it’s a bit strange  to get a worker error. Typical errors are lack of memory (which raises a MemoryError). Is there no extra info? (line in which the error is produced etcetera…)  are you running the code in a server which may limit your resources? A killed signal seems like if the process were closed by the user/superuser out of the python pipe itself