Lack permissions to successfully copy a space

Problem

User attempting to copy space encounters:

Starting copy with value ABC (0.0s)
Fetching source space with value EQS (0.0s)
Creating new space with value ABC (0.2s)
Copying existing permissions with current user as admin with value ABC Copied Space (0.2s)
---------- ERROR DETAIL ----------
ERROR creating space: "Oops! It looks like you don't have permissions to create a space in Confluence. Please ask your administrator to add you to a group which has 'Create Space' permission and try again. If this error continues, it may be caused by a bug within Confluence itself." with value ABC Copied Space (1.0s)
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Error: Confluence server error: post: 500: org.springframework.transaction.UnexpectedRollbackException: Transaction rolled back because it has been marked as rollback-onl

Cause

This usually happens only when the user has permissions to administer and create a space but is not a Confluence Administrator.

Solution

Deselect Copy Space Permissions (deselect to create a private space) option in the list of check boxes:

We released a fix for this in March 2019.