This error is becuase the plugin that you are using has been written for 3.6.0 and you are importing it into 3.5.4
To fix this, open the xml in your favorite text editor (preferably notepad unless you have another editor that you use such as htmlkit or notepad++) and search for all instances of 'executionorder' and remove that and the number attached to it. save it and reimport it. As long as you get all of them, it will work perfectly.
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