DATABASE ERROR CONNECTION FAILED!

[ENavarro]

Hello, again I ask for your help, you will see configure smtp and imap in the configuration part roundcube, then I wanted to re-enter the webmail and I get the following error in the part of the right image, in the left screen can see the logs Of errors, I hope some of your response, thank you very much!

[SKaero]

PHP can't access your database, check the value for the database host.