[Koha] koha on ubuntu: Date::Calc::Add_Delta_Days(): not a valid date...

[Khurram]

Hi

I have successfully installed koha on ubuntu.

But when i try to login from front end, it gives following error :

-----------------------------------------------------------------------------------------Software
error:

Date::Calc::Add_Delta_Days(): not a valid date at
/usr/share/koha/opac/cgi-bin/opac/opac-user.pl line 115.

For help, please send mail to the webmaster (webmaster at riphah-desktop),
giving this error message and the time and date of the error.

-----------------------------------------------------------------------------------------

Need Help, Thanks