postgresql error on installation

[packets]

This is the first time I gonna install scalix. I just install minimal CentOS 5.5. Now, when I installation scalix, it says it encounter an error when configuring web applications

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-> Confirm password:
Configuring PostgreSQL...   
Fatal error occured: Msg: An error occurred configuring Web applications -- check the log for errors.
Scalix Installer - cleaning up...
Scalix Installer - done.

I check the logs and below is the error:

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2010-10-17 07:01:11,029 INFO Setting JAVA_HOME environment variable to /usr/java/jre1.5.0_21
2010-10-17 07:03:00,193 INFO Configuring PostgreSQL...
2010-10-17 07:03:23,655 ERROR Operation failed: Failed to set password for the 'scalix' database user.

I'm not really familiar with postgresql. As a matter of face, I never use it at all. MySQL is my choice of RDBMS since I was exposed to linux and now I'm stuck with this one. I tried to command psql but it encountered an error:

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[root@techbreakfast log]# postgresql
-bash: postgresql: command not found
[root@techbreakfast log]# psql
psql: FATAL:  database "root" does not exist


I'm totally lost. Any help anyone?

[polleke]

reinstall the DB part.. Or ad a "trust" relattionship with localhost (search the forum for a solution, it's there )