Error 1045 when deleting a file, how to fix it?

Question

PHP

When deleting a file using the unlink() function, it gives an error:
Error : (1045) ProxySQL Error: Access denied for user 'root'@'2a02:4780:bad:f00d::a' (using password: NO)
If anything hosted server.

Answer 1

The error with unlink has nothing to do with it at all.
Error connecting to the database balancer.

Answer 2

If that server is hosted.

Are you sure you understand what you write?
hosting is a service for placing information on a server, how can there be a server on it? The site can be hosted, the server is not.
Access is denied, what's not clear here?
Search knows the solution for most errors - watch