wvdial | kernel_panic | perl_error

[Sebastian 'Frank©' Wieseler <franks.help@arcor.de>]

Hi guys,
I have several questions - please help me.

First:
Root can start wvdial but all other users get the error:
$ wvdial
--> WvDial: Internet dialer version 1.53
--> Cannot open /dev/ttyS0: Permission denied
--> Cannot open /dev/ttyS0: Permission denied
--> Cannot open /dev/ttyS0: Permission denied

But all this users belongs to the group tty.
Any idea?


Second:
When I boot my new build kernel I get the error:
[...]
read_super_block: can't find a reiserfs filesystem on (dev 01:00, block
64, size 1024)
read_super_block: can't find a reiserfs filesystem on (dev 01:00, block
8, size 1024)
Kernel panic: VFS: Unable to mount root fs on 03:42


But I have in my kernel the reiserfs-support (not as a modul!) under the 
"file systems". Need I more?
What have I done wrong? And what do you think can *I* do?


And last but not least everytime I start applications or install
something I get this message:

Gdk-WARNING **: locale not supported by C library

*or*

perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
       LANGUAGE = (unset),
       LC_ALL = (unset),
       LANG = "de_DE@euro"
   are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").

What can I do to fit the error-messages?

Thanks to everybody who helps me.
Thanks a lot.

Sebastian

P.S.:
I use Debian GNU/Linux called Woody with the Kernel 2.4.20