Error in mysql dump (ubuntu server 22.04 with cyberpanel)

I'm using Ubuntu 22.04 server with cyberpanel to host a wordpress website [gramfile.com]. When I'm trying to backup the database when running mysqldump -u [username] –p [database_name] > [dump_file.sql] I always receive this error message:

mysqldump: Got error: 1045: "Access denied for user '++++'@'localhost' (using password: YES)" when trying to connect

What should I do?