I have included ga script in my site and the line

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throws an exception like

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uncaught exception: [Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIDOMHistory.length]" nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "JS frame :: https://www.googleadservices.com/pagead/conversion.js :: j :: line 3" data: no]

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I am using Mozilla Firefox and i have firebug installed.So i could view this error.

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What could be the problem?