I successfully set up ActiveSync before, but I accidentally deleted the partnership on my PC recently, and I can't get the connection back on. I try to set up the partnership again by connecting my PC and the GMaster through null modem, but my PC can't detect the GMaster, and I get the following Communication error message on GMaster: Cannot start communications with the desktop computer. Remote Networking could not start due to a critical error (Error 678). What is error 678?