The XPathResult of XPath expression 'aa....aa' has an XPathResultType of bb....bb which cannot be converted to a single node. The method getSingleNodeValue applies only to types ANY_UNORDERED_NODE_TYPE and FIRST_ORDERED_NODE_TYPE.

The XPathResult of the XPath expression aa....aa contains XPathResultType of bb....bb that cannot be converted to a single node. The getSingleNodeValue method is applicable only to the ANY_UNORDERED_NODE_TYPE and FIRST_ORDERED_NODE_TYPE types.