JMR can't find the "Speaker (Digital Video Recorder)". Can you see it in your speakers? If not you will need to reinstall Jaksta Media Recorder and the speaker will be reinstalled.
If it is there could you please provide debug logs as per
Ensure debug is on before attempting a DVR recording.
I keep getting an error "Unable to find a speaker" when trying to record a show from Hulu through DVR. I use a wireless headphone and can hear fine when playing the show.