PredictionSummary 500 errors

Is anyone else getting the following response for http://data.tfl.gov.uk/TrackerNet/PredictionSummary/XYZ endpoints?

<?xml version='1.0' ?>

<env:Envelope xmlns:env=‘http://schemas.xmlsoap.org/soap/envelope/’>
env:Body
env:Fault
env:Client
Internal Error
</env:Fault>
</env:Body>
</env:Envelope>