**Describe the bug** Hi Wayne, I can't get the ATTiny10IDE to see my Arduino. After selecting my target(ATtiny85), building the sample code(Blink), and setting up the programmer as ArduinoISP, I get the following error when I try to upload the program: avrdude: Error: Invalid -P value: '/dev/cu.usbmodem14601' Use -P usb:bus:device avrdude done. Thank you. <img width="576" alt="Screen Shot 2019-05-26 at 11 23 54 AM" src="https://user-images.githubusercontent.com/51036652/58385141-fa2d0b00-7fa8-11e9-9d90-cf166b4fb5f0.png"> <img width="519" alt="Screen Shot 2019-05-26 at 11 24 51 AM" src="https://user-images.githubusercontent.com/51036652/58385142-fbf6ce80-7fa8-11e9-83ac-cf30abe7443a.png"> The Arduinos that Ive tried to use(Uno & Nano) have the Arduino ISP Sketh already uploaded into them and can program the ATtiny85 using the Arduino IDE. I've had no success on both Mac & Windows.