TIEHASH not found in Apache::Session::File

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Permission denied at /usr/lib/perl5/site_perl/5.6.0/Apache/Session/SysVSemaphoreLocker.pm line 46.

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$self->{sem} = new IPC::Semaphore($self->{sem_key}, $self->{nsems}, IPC_CREAT | S_IRWXU) || die $!;