[Koha] Strange behaviour, needed help

[Ali Frihida]

Hy,

each time try to activate the 127.0.1.1:8080 to access koha, I receive
the following error:
==========
Koha error

The following fatal error has occurred:

Can't locate Date/Calc.pm in @INC (@INC contains: /usr/share/koha/lib
/etc/perl /usr/local/lib/perl/5.10.0 /usr/local/share/perl/5.10.0
/usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.10
/usr/share/perl/5.10 /usr/local/lib/site_perl .) at
/usr/share/koha/lib/C4/Dates.pm line 24.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Dates.pm line 24.
Compilation failed in require at /usr/share/koha/lib/C4/Members.pm line 23.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Members.pm line 23.
Compilation failed in require at /usr/share/koha/lib/C4/Auth.pm line 27.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Auth.pm line 27.
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.

===================
I assume it can be originated by a combination of cpan,C4 and perl
errors. I tried to reload all the needed libraries and dependencies
but still doesn't work...

Maybe one of you have already encountered this error and can direct me
to the obvious but hidden

Thanx

-- 
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Dr Ali Frihida
University Tunis El Manar
ENIT, Département TIC, LTSIRS
BP 37, 1002 Tunis Le Belvédère, Tunisie
Tél    :(+216) 71 874 700 (#563)
Fax   :(+216) 71 872 729
Skype: ali_frihida
http://www.enit.rnu.tn