error in the webmail

[mad4host]

when I try to enter web mail from cPanel I found error
"Login failed because your username or password was entered
incorrectly."

"Notice: Unknown(): Login failed. (errflg=1) in Unknown on line 0

Notice: Unknown(): Login failed. (errflg=1) in Unknown on line 0

Notice: Unknown(): Login failed. (errflg=1) in Unknown on line 0

Notice: Unknown(): Too many login failures (errflg=2) in Unknown on line
0"

how can I resolve this problem

I'm the root and this is my server