Uploading sketch to Arduino Leonardo ?


I tried to upload my sketch to Arduino Leonardo, but always got COMXX is already being used....
I can see Arduino Leonardo is in that port COMXX already, but no luck uploading...

Any clues ?


Any clues ?

You've given very little information to go on. What might be preventing the IDE from opening the com port? Do you have any bluetooth stuff attached to your PC?

Sometimes it needs a few tries to get a program to upload to a Leonardo.