nullCannot instantiate class. Please check the spec attribute.

[SimonGreenhill]

I get the following error when trying to run the PathSampling app:

beast.util.XMLParserException:
Error 1006 parsing the xml input file

nullCannot instantiate class. Please check the spec attribute.

Error detected about here:
  <beast>
      <subtemplate id='HyperPrior'>
          <connect>

    at beast.util.XMLParser.createBeastObject(Unknown Source)
    at beast.util.XMLParser.createObject(Unknown Source)
    at beast.util.XMLParser.parseInputs(Unknown Source)
    at beast.util.XMLParser.createObject(Unknown Source)
    at beast.util.XMLParser.parseFragment(Unknown Source)
    at beast.util.XMLParser.parseBareFragment(Unknown Source)
    at beast.app.beauti.BeautiConfig.initAndValidate(Unknown Source)
    at beast.app.tools.PathSampler.main(Unknown Source)

... this happens if I use the GUI or try to run it via appstore PathSampler.