[Rails] puzzled by Mutex lock call ..

I have some code that uses and instance of Mutex and calls
@mutex.lock, executes some code and then does
unlock(). When I call lock() I get some ActiveRecord error which seems
unrelated.

Couldn't find ActiveJob with ID=3
["/home/LGuild/.gem/ruby/1.8/gems/activerecord-2.3.5/lib/active_record/
base.rb:1586:in `find_one'", "script/jobmgr.rb:107:in `lock'",

This is on Fedora 12, I haven't a good idea on how to troubleshoot
this ..

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