Have you tried to install the latest driver from our drivers page? I believe that Tableau Server 8.0.0 requires an updated MySQL driver to function correctly. The error prompt alludes to an older version of the MySQL driver being used on your Server machine.
Please see the link below and the note from the drivers page below:
NOTE: For Tableau 8 users, we recommend using the latest MySQL 5.2.x 32-bit Unicode ODBC driver. Links to MySQL downloads page.
Please let me know if the issue gets resolved by installing the new driver.