No, it's about directive "requires" used to get a list of authorization requries
$r->requires
http://perl.apache.org/docs/2.0/api/Apache2/Access.html#C_requires_

It's written in documentation about support of apache 2.4, so I thought I won't have any problems.

Could you show the (minimum) code for a handler that is causing the error? I don't have access to a modperl installation today but someone else might see something.

So I have apache 2.4 + mod_perl 2.0.9 (latest version including Apache 2.4 support as written on site)

Apache 2.4 config (standart)

PerlAuthenHandler auth::auth->authen_handler # <-- this works fine
PerlAuthzHandler auth::auth->group_handler

AuthType basic
AuthName 'Restricted Area Access'

require group group1
[download]

module (PerlAuthzHandler) code

sub group_handler {
    my ($self, $r) = @_;

    my $requires = $r->requires;
    ...
    <so I have a list of requries, connect to my db and check if this 
+user may pass>
}
[download]

Here
http://perl.apache.org/docs/2.0/api/Apache2/Access.html#C_requires_
described output of $r->requires