Hi...Make sure you have selected the port of your Arduino board from the Tools > Port menu.
Sometimes the port will be labeled with the board name in the menu. Other times it will not. If you don't know which port is your Arduino, you can find it like this:
Unplug your Arduino board from the computer.Tools > PortNote the ports, if any, listed in the menu.Close the Tools menu. The ports list is only updated when the Tools menu is re-opened, so this step is essential.Plug your Arduino board into the computer.Tools > Port - The new port listed in the menu is your Arduino board.
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