It can mean that your board is not connected at all, or the drivers have not been installed (if necessary) or that the wrong serial port is
selected.
If you encounter this, go back to Lesson 0 and check your installation.
Once the upload has completed, the board should restart and start blinking. Open the code
Note that a huge part of this sketch is composed of comments. These are not actual program instructions; rather, they just explain how
the program works. They are there for your benefit.
Everything between /* and */ at the top of the sketch is a block comment; it explains what the sketch is for.
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