#create CGI query object to get the SSO from URL
my $sso = new CGI;
my $sso = $query->param( "sso" );

##</code><code>##

#create CGI query object to get the SSO from URL
my $query = new CGI;
my $sso = $query->param( "sso" );

##</code><code>##

Global symbol "$query" requires explicit package name (did you forget to declare "my $query"?) at ...

##</code><code>##

use CGI::Carp 'fatalsToBrowser';

##</code><code>##

"my" variable $sso masks earlier declaration in same scope at ...