[Warning] Access denied for user 'root'@'localhost'

[feerdispzoo]

Oct 09 03:30:37 vim735ac.flexlyserver.net mysqld[1500587]: 2022-10-09  3:30:37 8 [Warning] Access denied for user 'da_admin'@'localhost' (using password: YES)
Oct 09 03:30:37 vim735ac.flexlyserver.net mysqld[1500587]: 2022-10-09  3:30:37 9 [Warning] Access denied for user 'root'@'localhost' (using password: NO)
Oct 09 03:30:37 vim735ac.flexlyserver.net mysqld[1500587]: 2022-10-09  3:30:37 10 [Warning] Access denied for user 'root'@'localhost' (using password: NO)
Oct 09 03:30:40 vim735ac.flexlyserver.net mysqld[1500587]: 2022-10-09  3:30:40 13 [Warning] Access denied for user 'da_admin'@'localhost' (using password: YES)
Oct 09 03:30:40 vim735ac.flexlyserver.net mysqld[1500587]: 2022-10-09  3:30:40 14 [Warning] Access denied for user 'root'@'localhost' (using password: NO)
Oct 09 03:30:40 vim735ac.flexlyserver.net mysqld[1500587]: 2022-10-09  3:30:40 15 [Warning] Access denied for user 'root'@'localhost' (using password: NO)

I fallow to guide:

Troubleshooting | Directadmin Docs

DirectAdmin Knowledge Base

docs.directadmin.com

The problem is, I can correct login to mysql root and da_admin using password correct by:
mysql -u root -p and mysql -u da_admin -p

all passwords working correct, password stored at options.conf is the same as I use to login.

Due to this, Im not sure why mysql display this error.