fail to import .mxl files created by Audiveris

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE score-partwise PUBLIC "-//Recordare//DTD MusicXML 3.0.1 Partwise//EN" "http://www.musicxml.org/dtds/partwise.dtd">
<score-partwise version="3.0.1">
  <identification>
    <encoding>
      <software>Audiveris 5.1.1</software>
      <supports type="yes" element="print" attribute="new-system" value="yes"></supports>
      <supports type="yes" element="print" attribute="new-page" value="yes"></supports>
      <software>ProxyMusic 3.0.1.8e1a2c5</software>
      <encoding-date>2020-05-07</encoding-date>
    </encoding>
    <source>/Users/frostzhang/sample/audiveris/testData/SKM_C454e20050815190.pdf</source>
    <miscellaneous>
      <miscellaneous-field name="source-file">/Users/frostzhang/sample/audiveris/testData/SKM_C454e20050815190.pdf</miscellaneous-field>
      <miscellaneous-field name="source-sheet-1">1 2 3 4 5</miscellaneous-field>
    </miscellaneous>
  </identification>
  <defaults>
    <scaling>
      <millimeters>6.7733</millimeters>
      <tenths>40</tenths>
    </scaling>
    <page-layout>
      <page-height>1752</page-height>
      <page-width>1240</page-width>
      <page-margins type="both">
        <left-margin>80</left-margin>
        <right-margin>80</right-margin>
        <top-margin>80</top-margin>
        <bottom-margin>80</bottom-margin>
      </page-margins>
    </page-layout>
    <lyric-font font-family="Default" font-size="10"></lyric-font>
  </defaults>
  <part-list/>
</score-partwise>