First of I am running Windows 7, have a Mega2560. I have had it for about a week now and have loaded multiple sketches to it in the past few days and now it has all of a sudden stopped uploading new sketches. I was in the process of loading the Repetier firmware onto it for a 3D printer project and it just stopped excepting new sketches.
The error that i get is
avrdude: ser_open(): can't open device "\.\COM9: The system connot find the file specified.
avrdude: ser_drain(): read error: The handle is invalid.
Thank you for your help