error while searching for email in hostinger

[thadeu220v]

i've implemented a custom version of roundcube, for a company where do i am employeed, but there isa ridiculous problem

my /logs/errors.log folder increases everyday with the same thing, and god knows hot to fix.

well... basically it shows me the following error while checking for emails...

IMAP Error: Login failed for [email protected] against imap.hostinger.com.br from 189.61.131.38. AUTHENTICATE PLAIN: * BAD internal server error in /home/user/domains/rahra.com.br/public_html/email/program/lib/Roundcube/rcube_imap.php on line 200 (GET /email/?_task=mail&_action=list&_refresh=1&_layout=widescreen&_mbox=INBOX&_page=1&_remote=1&_unlock=loading1596469641113&_=1596469293325)


it does shows this email at all time, and god knows what it is...
here are my imap settings, for some reasons i don't know where to insert the imap and smtp ports (maybe this is one of the problems)

the ports are the same used by gmail, 993 for imap smt 587

here is the my configuration file, where it does shows the settings for imap and smtp...
the email client are pretty beautiful, so we don't want to delete it!

// ----------------------------------
// IMAP
// ----------------------------------
// The IMAP host chosen to perform the log-in.
// Leave blank to show a textbox at login, give a list of hosts
// to display a pulldown menu or set one host as string.
// Enter hostname with prefix ssl:// to use Implicit TLS, or use
// prefix tls:// to use STARTTLS.
// Supported replacement variables:
// %n - hostname ($_SERVER['SERVER_NAME'])
// %t - hostname without the first part
// %d - domain (http hostname $_SERVER['HTTP_HOST'] without the first part)
// %s - domain name after the '@' from e-mail address provided at login screen
// For example %n = mail.domain.tld, %t = domain.tld
// WARNING: After hostname change update of mail_host column in users table is
//          required to match old user data records with the new host.
$config['default_host'] = 'imap.hostinger.com.br';

// ----------------------------------
// SMTP
// ----------------------------------
// SMTP server host (for sending mails).
// Enter hostname with prefix ssl:// to use Implicit TLS, or use
// prefix tls:// to use STARTTLS.
// Supported replacement variables:
// %h - user's IMAP hostname
// %n - hostname ($_SERVER['SERVER_NAME'])
// %t - hostname without the first part
// %d - domain (http hostname $_SERVER['HTTP_HOST'] without the first part)
// %z - IMAP domain (IMAP hostname without the first part)
// For example %n = mail.domain.tld, %t = domain.tld
$config['smtp_server'] = 'smtp.hostinger.com.br';


please help me!

[alec]

"BAD internal server error" means the problem is on the IMAP server side.