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When I copy-pasted your xacro and tried to load, the same error happens. When I typed all letters it runs. For refenrece here's what I used.

<?xml version="1.0"?>
<robot name="flexible" xmlns:xacro="http://ros.org/wiki/xacro">

  <xacro:macro name="test_macro">
    <test name="x"/>
  </xacro:macro>

  <xacro:test_macro />
</robot>

I haven't gone any further but do you use special character encoding or something?