ERROR_INVALID_OWNER problems

[NicolasDu]

we've tried this program to make a copy of our SMB shared folder and files.
most of it went well, but every single error we got was:
"ERROR_INVALID_OWNER: This security ID may not be assigned as the owner of this object. [SetFileSecurity]"
"Cannot write permissions of "X:\xxxxxx\xxxxxx.ffs_tmp"."
as we have used the function to "Copy DACL, SACL, Owner, Group", we can understand that there could have been errors with rights, but the copy was made with the highest admin we have... that admin can open the files listed

we had about 10% of our files have that error(310 000 times total), any idea how to complete the copy? we're trying to migrate the data to another server to separate data from an application server and have as little downtime as possible. Copying the access rights are required in this case, it would take days to remake those.

[NicolasDu]

after analyzing the folders with the most errors, we found that the owners were groups instead of individuals, so we started changing the owner of those and we got a lot of those errors removed.... all the big folders are gone, but i still got hundreds of folders to change the owner...

not all owners are groups, sometimes it's individuals... i have no idea why the problem is present, but it seems that changing the owner makes it able to sync the files