I solve this problem. Instead of such a format of the XML:
<System>
<systemFullName>aaaa</systemFullName>
<systemShortName>a</systemShortName>
</System>
<System>
<systemFullName>bbbb</systemFullName>
<systemShortName>b</systemShortName>
</System>
I used this format:
<startXML>
<System>
<systemFullName>aaaa</systemFullName>
<systemShortName>a</systemShortName>
</System>
<System>
<systemFullName>bbbb</systemFullName>
<systemShortName>b</systemShortName>
</System>
</startXML>
He is the same, only with the opening and closing tags at the beginning and end of the file. Sigh.