Can't connect to RoundCube (Blank page)

[Clikti]

Hello,

I have installed RoundCube on a Debian 6.0 server after Postfix+Spamassassin+amavis+clamav to check my mail from anywere I will be.

I can join RoundCube from http://my_server_ip_address/webmail
This asked me for a username and password.
... Athentification error

Check the log :

[28-Apr-2011 14:54:42 +0200]: IMAP Error: Login failed for roundcube from 192.168.17.24. LOGIN: Login failed. in /var/www/webmail/program/include/rcube_imap.php on line 192 (POST /webmail/?_task=login&_action=login)

Does anyone know why I get this error ?

Thank you in advance

Clikti

[Clikti]

My problem is solved.
I can now connect to roundcube and receve and send e-mail

But I have another problem :
I only have a mailbox dir, I don't have a dir "sent", "trash" etc.
If I wanna create a dir on roundcube this error coms out:

An error prevented the backup

Thanks in advance
Clikti

[billsuspect]

How did you solve the original login problem, please?