Hello, to add to the above poster, you can take the machine off the network, plug into a laptop, powercycle machine see if it comes to ready and try to print. If it does print fine, i would flash the latest firmware, then put it back on the network, if the error comes back after the update, clear the que, powercycle. If it works after clearing then you have an issue with the file being sent to the machine, probably a corrupt file or something.
Hope this helps....