If your server reports the "Call to undefined method JXMLElement::getElementByPath() in ... on line ..." error during a Joomla Extension installation, in most cases the cause of this message is, that your extension is not compatible to your Joomla version.
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Fatal error: Call to undefined method JXMLElement::getElementByPath() in
joomla 1.5
joomla 1.6
Joomla 1.7
joomla 2.5
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