when adding manufacturers in virtuemart2 VM2 virtuemart 2 displays errors

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when i tried adding manufacturers i got this error with many others following. What could be the problem

VirtuemartViewManufacturer::$lists in C:\wamp\www\Trippleplaylive\administrator\components\com_virtuemart\views\manufacturer\tmpl\default.php on line 31

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By the way my joomla version is 1.7 with VM2