Hey Guys,
I dont know if your problem still exists, I also got the same errors while using the
/tool user-manager export
command.
Now, I have come to a solution, what I did is,
/tool user-manager router export file=router
I did this for each 'section' or user-manager, i.e. customer, user, and router, copied the files to me new router, and imported them individually, and this worked.
/import customer
/import user
/import router
Only problem is this does not keep the users bandwidth usage and session logs, if anybody knows how to get this then please let me know
I hope this helps you guys