There's not a lot of detail to go on with this question, but I think you're trying to set up Bitbucket Server with MySQL 5.7.
MySQL 5.7 is not supported at this time - partially because of this problem. We're working on adding support, but this is not available yet. If possible, I'd suggest using MySQL 5.6.x or Postgres.
Cheers,
Michael
Bitbucket (now?) supports MySql 5.7+. You can fix this by stopping your application server, edit the /bitbucket-home/shared/bitbucket.properties by removing the value beyond and restarting:
&sessionVariables=storage_engine%3DInnoDB
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