Undefined error when trying to load XML-Collection of common programming errors

If you can change your schema, prefer to store your inner XML files to CDATA section, if not then try to think about following.

Parser failed on your element attribute value most probably due to quote character contained in an XML file you’ve tried to store there. Consider the following case for instance:

As you can see, you might confuse parser with the quote char from that inner XML, so that it could take the above line as: