Common Mirth Error Messages

org.mule.umo.transformer.TransformerException: java.lang.ArrayIndexOutOfBoundsException: 2 (com.webreach.mirth.model.converters.SerializerException)

Mirth is trying to parse an XML document as HL7.
Make sure the channel is being sent rawdata and the message templates in the channel transformers are set to the right formats.