The XPathResult of XPath expression '{0}' has an XPathResultType of {1} which cannot be converted to a single node. The method getSingleNodeValue applies only to types ANY_UNORDERED_NODE_TYPE and FIRST_ORDERED_NODE_TYPE.

XPath式{0}のXPathResultに，単一ノードに変換できない{1}のXPathResultTypeがあります。getSingleNodeValueメソッドはANY_UNORDERED_NODE_TYPE型およびFIRST_ORDERED_NODE_TYPE型だけに適用します。