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The USB port isn't set to writable. Run sudo chmod a+rw /dev/ttyUSB0 to make it writable by all users.

You can add a udev rule to make USB ports be writable by all users by default. Make a file called 75-usb-rw.rules in /etc/udev/rules.d and add the following to it:

SUBSYSTEMS=="usb", KERNEL=="ttyACM[0-9]*", MODE="0666"
SUBSYSTEMS=="usb", KERNEL=="ttyUSB[0-9]*", MODE="0666"