[Koha] KOha 3 not respond

[john smith]

Hi to all
i had installed koha 3 on ubuntu 8.04 and all steps ok and finally when open http://125.452.125.45:8080
koha not respond 
and error is:
Koha error
						The following fatal error has occurred:
 
                        Unknown database 'koha' at /usr/share/koha/lib/C4/Context.pm line 666.
Compilation failed in require at /usr/share/koha/lib/C4/Circulation.pm line 25.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Circulation.pm line 25.
Compilation failed in require at /usr/share/koha/lib/C4/Overdues.pm line 24.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Overdues.pm line 24.
Compilation failed in require at /usr/share/koha/lib/C4/Members.pm line 27.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Members.pm line 27.
Compilation failed in require at /usr/share/koha/lib/C4/Auth.pm line 31.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Auth.pm line 31.
Compilation failed in require at /usr/share/koha/intranet/cgi-bin/mainpage.pl line 23.
BEGIN failed--compilation aborted at /usr/share/koha/intranet/cgi-bin/mainpage.pl line 23.
please if any body can help me 

thnks

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