[MY-010457] [Server] --initialize specified but the data directory has files in it. Aborting.

This error message indicates that you are trying to initialize a MySQL server with the --initialize option, but there are already files present in the data directory. This can happen if you have previously installed MySQL on the same server or if there are other files present in the data directory.

To resolve this issue, you should first make a backup of any important data in the data directory. Then, you can either delete the existing files in the data directory or choose a different data directory for the new MySQL server installation.

Once you have resolved the issue with the data directory, you can try running the MySQL server initialization command again with the --initialize option. This should create a new MySQL data directory with the necessary files and set up the server for use.