I just got my first 3D printer, a Monoprice Select Mini #d V2. I could not read the miniSD card so downloaded Cura version 15.04.6 as well as Repetier Host. I checked the COM ports and the printer is in COM4. When I try to print a gcode file, I get various errors in Cura mainly saying "failed to autodetect serial port" even tho it is set to COM4. Even when it queries COM4, it errors.