This error happens when you have a dataset with explicit UIDs and your Zero is a pretty new instance. Also, you are using the flag --new_uids=false which corroborates with the emergence of the problem. If you wanna avoid this issue, you would use --new_uids=true always.
If you wanna track the mapping of UIDs you have options such as:
-x, --xidmap string Directory to store xid to uid mapping