What does `torch/distributed/fsdp/flat_param.py", line 1999, in _check_storage_allocated p_assert(storage_size > 0, "Expects storage to be allocated")` assertion do?

What does torch/distributed/fsdp/flat_param.py", line 1999, in _check_storage_allocated p_assert(storage_size > 0, "Expects storage to be allocated") assertion do?

What can be the possible causes for storage size being 0?

Getting the same error. Any ideas?

Could you post a minimal and executable code snippet reproducing the error, please?