Here are some of the common error.

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BungeeCord/Velocity part/Non-Extended version:

MySQL Errors:

Access denied:

Error:

java.sql.SQLException: Access denied for user 'user'@'host' (using password: YES)

Where this error can be found:

This error can be found when the server is starting and it is the first line of the error.

Cause of the error / How to fix it:

• Password/Username is wrong. Please correct it.
• If you are using a rented MySQL server or a MySQL user which has not access to every database you should check, if you have access to that DB (in the most cases of rented MySQL server the database name is the same as the username)