Unable to create new users after Site Import

Oops - an error has occurred

(https://example.atlassian.net/wiki/)System Error
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a copy of the error and system information found below
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Cause

com.atlassian.confluence.core.InsufficientPrivilegeException: User [example] does not have the required privileges.
at com.atlassian.confluence.user.DefaultUserAccessor.addMembership(DefaultUserAccessor.java:169)