When I restore , the target database contains tables whose names collide with bitbucket table

[Yoon TaeHee]

Hello.

I restore bitbucket server Using the Bitbucket Server Backup Client.

I followed steps in Restoring Bitbucket Server to use a newly created DB in

restore document(https://confluence.atlassian.com/bitbucketserver/using-the-bitbucket-server-backup-client-776640064.html) .

Steps are:

1.Create a new empty home directory using the user account that will be used to run Bitbucket Server.
2.Create the database. It should have the configuration described in the ' Create the Bitbucket Server database'   section of the  relevant page here:
3.Run the Restore Client.  See the following section for details.
On Step 3, Database and Home directory is restored. And then I  do step 4.

4.Install Bitbucket server on the new server by following the instructions on Running the Bitbucket Server installer. Point the installation to an empty directory and install it as a service in case you used to have that in your previous server.

When I Installed bitbucket server and access to bitbucket Url,  it asked me which database I want to use. I fill the form with PostgresDB information which is restored from step 3.

Then Bitbucket says "The target database contains tables whose names collide with bitbucket tables. Please migrate to a clean, empty database. For more information about creating a database for use with Bitbucket, please refer to the Bitbucket documentation."

But I think restored existing PostgreSQL DB naturally collide with bitbucket table and can't be empty because it's restored from step 3.

What's wrong with this problem? Thank you.