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Please ignore that message. It was generated by the javascript used internally after loading an xhtml page into Preview to find the current location. That $ refers to a jQuery javascript library that should always have been loaded before this javascript was run but for some reason, that does not always happen in the correct order. It appears to be a race of some sort. It is random and should not impact performance and can be safely ignored..
I have been trying to track it down and get it fixed for the last few releases but there is no easy way to test for the jquery library being fully loaded vs partially loaded that I can find.
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