This line: ->N45 T0*11 [38.980]seems to indicate that MatterControl is sending something that is not a command. I'd like to investigate further, but will need more information. Can you please send the Model File, Slice Settings, and G-Code File as outlined in this article? http://wiki.mattercontrol.com/Send_Debugging_Information#Other_Useful_FilesPlease use Dropbox or Google Drive to share the files, then post the share link here.