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Arduino: 1.6.7 (Windows 7), Board: "Arduino/Genuino Uno"

WARNING: Category '' in library Firmata is not valid. Setting to 'Uncategorized'

Sketch uses 4,714 bytes (14%) of program storage space. Maximum is 32,256 bytes.
Global variables use 382 bytes (18%) of dynamic memory, leaving 1,666 bytes for local variables. Maximum is 2,048 bytes.
avrdude: ser_open(): can't open device "\\.\COM8": Access is denied.


Problem uploading to board. See Arduino - Troubleshooting for suggestions.

This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences.