Prototype mismatch

I get the following messages in my apache2/error.log when I restart.
Why is that?  What steps should I take to diagnose the problem?

The line in the script where this ocures says:

use FileHandle;


cheers
Worik


Prototype mismatch: sub Apache::AdMachine::Track::LOCK_UN: none vs ()
Prototype mismatch: sub Apache::AdMachine::Track::LOCK_NB: none vs ()
Prototype mismatch: sub Apache::AdMachine::Track::SEEK_END: none vs ()
Prototype mismatch: sub Apache::AdMachine::Track::LOCK_EX: none vs ()
Prototype mismatch: sub Apache::AdMachine::Track::LOCK_SH: none vs ()
Prototype mismatch: sub Apache::AdMachine::Track::_IOFBF: none vs ()
Prototype mismatch: sub Apache::AdMachine::Track::_IOLBF: none vs ()
Prototype mismatch: sub Apache::AdMachine::Track::_IONBF: none vs ()
Prototype mismatch: sub Apache::AdMachine::Track::FD_CLOEXEC: none vs ()
Prototype mismatch: sub Apache::AdMachine::Track::F_DUPFD: none vs ()
Prototype mismatch: sub Apache::AdMachine::Track::F_EXLCK: none vs ()
Prototype mismatch: sub Apache::AdMachine::Track::F_GETFD: none vs ()
Prototype mismatch: sub Apache::AdMachine::Track::F_GETFL: none vs ()
Prototype mismatch: sub Apache::AdMachine::Track::F_GETLK: none vs ()
Prototype mismatch: sub Apache::AdMachine::Track::F_GETLK64: none vs ()
Prototype mismatch: sub Apache::AdMachine::Track::F_GETOWN: none vs ()

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