DSCAlarmPanel: Unknown Envisalink Module Response Code

I recently installed DSC Alarm Panel plugin (Vera lite with UI7 and ELV3) and most everything seems to be working. I can create scenes to turn on lights when the alarm is tripped, unlock doors when fire alarm trips etc., but I cannot have a scene arm or disarm (nothing happens). I have the EnableRemoteArm variable set to disarm. The status of the alarm is correctly reported when I arm and disarm from the DSC keypad. I have searched the web and this forum, but cannot find anything with the message above. Anyone have any ideas? Thanks.