[otrs] Ticket ACL CloseParentAfterClosedChilds

[CARNINO Daniele]

Hello all,
I'm very interested in using ACL CloseParentAfterClosedChilds, but when
I enable the ACL by putting the following lines in my Config.pm file:
 
   $Self->{'Ticket::Acl::Module'}->{'1-Ticket::Acl::Module'} = {
   'State' => [ 'closed succesful', 'closed unsuccesful', ],
   'Module' =>
'Kernel::System::Ticket::Acl::CloseParentAfterClosedChilds'
   };
 
I always get back this error:
 
Can't locate object method "LinkList" via package
"Kernel::System::LinkObject" at
/opt/otrs//Kernel/System/Ticket/Acl/CloseParentAfterClosedChilds.pm line
67.
 
I'm running OTRS 2.2.7 and i use latest version (1.9) of
CloseParentAfterClosedChilds.pm
 
Any idea?
Why a double slash after /opt/otrs in the error? It is normal?
I have:

    $Self->{Home} = '/opt/otrs'

In my Config.pm

Cheers, d.
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