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Importing Topic Trees via Full Content Swap

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I have some Topics that I want to import via the Content Swap functionality using the content.xml file. It works fine for the most part. When I try to import a Topic Tree it throws an error.

The format of the XML to be imported is:

<trees>
    <tree type="topic" default="1">
      <topic_category name="Concrete5">
        <topic name="General"/>
        <topic name="Design"/>
        <topic name="Development"/>
        <topic name="Intro"/>
      </topic_category>
      <topic_category name="Wordpress">
        <topic name="General"/>
        <topic name="Design"/>
        <topic name="Development"/>
      </topic_category>
      <topic_category name="Joomla">
        <topic name="General"/>
Viewing 15 lines of 20 lines. View entire code block.


The error message is:

Whoops\Exception\ErrorException thrown with message "Call to a member function getRootTreeNodeObject() on a non-object"

Stacktrace:
#0 in /opt/lampp/htdocs/sample_content/concrete/src/Tree/Tree.php:83

Might this be a naming conflict? Too many trees?
jakobfuchs