You've pointed your new Jira at data that was created with a more recent version.
You either need to clear out the database, create a new empty database for the new system to use, or use a version of Jira that it at the same or higher version as the data.
I'd recommend creating a new empty database, as if you don't know how to clear the data out of a database, you might not know enough about it to be using it safely. With a new database, you won't be risking deleting something you actually need.
(If you insist though, drop all the tables in the database)
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