Hi, I'm currently rewriting perl script, and I got an error while I'm been running it. Here is my code

sub loadPage {
    my $page = "";
    $page = $query->param("page");    
    if ($page eq 'main') {
    loadMainPage();
    return 1;
    }
}
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My error message is the following : Fri Dec 21 14:32:11 2018 error client 127.0.0.1 Fri Dec 21 14:32:11 2018 helloWorld.cgi: Use of uninitialized value $page in string eq at /home/alexandre/apache/cgi-bin/helloWorld.cgi line 41. Any idea ? Thanks in advance. Alexandre Jaquet