Subject Erroring Restoring backup file created with v2.1 to version 2.5
Author slalom91
When running the restore process on v2.5 I am receiving the following error:

"attempt to store duplicate value (visible to active transactions) in unique index "RDB$INDEX_39"

I have reviewed the RDB$INDICES table on the source database and this index refers to the RDB$ROLES table and specifically is the unique index on RDB$ROLE_NAME. Their is only one record in RDB$ROLES and it is the RDB$ADMIN role.

Any ideas on how to address this issue?