Avrdude: ser_open(): can't open device "\\.\COM3": A device which does not exist was specified

Hello Everyone,

I have received a robot kit year ago and was unable to connect it to my usb port. I have downloaded drivers etc. etc. but could not figure out what is wrong. I bought a new computer recently and I have re-tried to run the robot but somehow I still see same error message with it. I have also tried to run it with my linux machine but no luck.

This is the robot kit: DIY 4-DOF Robot Kit - Sloth - sunfounder
Per instruction it has a arduino uno which is not like a regular uno but if you can check you can observe I have same robot as seen in the link.

What I am trying to run is simple. There are some codes they sent with the following link, I am trying to load one of these code which is "simple robot" (I have tried others too as well) I am getting following error message.

Sketch uses 3750 bytes (12%) of program storage space. Maximum is 30720 bytes.
Global variables use 226 bytes (11%) of dynamic memory, leaving 1822 bytes for local variables. Maximum is 2048 bytes.
avrdude: ser_open(): can't open device "\\.\COM3": A device which does not exist was specified.


Failed uploading: uploading error: exit status 1

I have unplugged other USB ports.

I have chosen my board, port and processor as following. Could not figure out so decided to ask which I should do at the beginning before messing with it 1,5 years:)

Hope to figure it out soon by your helps.

Thank you

If it's an UNO, you should select that as your board,
You can verify you have chosen the correct port, by unplugging the Arduino and it should disappear from the list of options, and re-plugging it should make it show up again.

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