Error reading fcpxml file

[tacman]

I'm getting an error when reading an fcpxml file. A short example is below, but it's not specific to this file, but rather the format (Apple's Final Cut Pro xml)

There error is in /fluidxml/source/FluidXml/FluidContext.php (line 216)

Argument 1 passed to DOMNode::appendChild() must be an instance of DOMNode, boolean given

Here's the xml:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE fcpxml>
<fcpxml version="1.8">
    <resources>
        <format name="FFVideoFormat1080p2997" width="1920" frameDuration="1001/30000s" height="1080" id="r0"/>
        <format name="FFVideoFormat720p2997" width="1280" frameDuration="1001/30000s" height="720" id="r1"/>
        <format name="FFVideoFormatRateUndefined" width="2988" height="5312" id="r3"/>
        <asset src="file://localhost/C:/JUFJ/Claire/clair-11.MOV" start="0/1s" audioSources="1" name="clair-11.MOV" hasVideo="1" format="r1" duration="1680679/1000s" hasAudio="1" audioChannels="2" id="r2"/>
        <asset src="file://localhost/C:/JUFJ/Claire/2018-10-23([2-2]).jpg" start="0/1s" name="2018-10-23([2-2]).jpg" hasVideo="1" format="r3" duration="0/1s" id="r4"/>
    </resources>
    <library>
        <event name="ManualReferenceTImeline (Resolve)">
            <project name="ManualReferenceTImeline (Resolve)">
                <sequence tcFormat="NDF" format="r0" duration="1802801/30000s" tcStart="18018/5s">
                    <spine>
                        <asset-clip tcFormat="NDF" start="3003/10s" name="clair-11.MOV" format="r1" duration="1802801/30000s" enabled="1" ref="r2" offset="18018/5s">
                            <adjust-transform position="0 0" anchor="0 0" scale="1 1"/>
                            <video start="0/1s" name="2018-10-23([2-2]).jpg" duration="113113/3750s" enabled="1" lane="1" ref="r4" offset="3302299/10000s">
                                <adjust-transform position="0 0" anchor="0 0" scale="1 1"/>
                            </video>
                        </asset-clip>
                    </spine>
                </sequence>
            </project>
        </event>
    </library>
</fcpxml>