The useful option here is error_context => 1 which will display the line where the error occurs. This indeed shows that there is a & in the data. This is not allowed in XML, you have to replace it by &amp;. There are a certain number of those in the file, along with a < on line 2614 thr needs to be replaced by &lt; and a <<SW>> that needs to become &lt;&lt;SW>> on line 11037.

Note that you don't need a field sub either, this is already a method, $member->field( 'name') works just fine.