Bulk User Move to OU with CSV Import

Bulk User Move to OU with CSV Import

I import my csv with around 3000 users. I then try and move them to a specified OU, but whenh you click apply it just loads a blank page and nothing happens. I know i am doing it right, because if i just select say 10 users from the list and click APPLY to move to OU that works fine.

Any ideas??

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