[Koha-devel] install problem

[Luis Valdes Guerrero]

i was installing koha3 alpha and i have the follow error

Software error:

Can't call method "do" on unblessed reference at /usr/share/koha/lib/C4/Context.pm line 609.
Compilation failed in require at /usr/share/koha/lib/C4/Members.pm line 24.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Members.pm line 24.
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/opac/cgi-bin/opac/opac-main.pl line 22.
BEGIN failed--compilation aborted at /usr/share/koha/opac/cgi-bin/opac/opac-main.pl line 22.

CGI::Carp 

this was in the firefox, at time to see intranet and opac

tell me what is the error