If something went wrong with compilation, you will get red warning/error text in the
bottom window letting you know what the error was. It will also highlight the line with
an error.
For example, here I had the wrong board selected - and the selected board does not
have a built in LED!
Here's another common error, in my haste I forgot to add a ; at the end of a line. The
compiler warns me that it's looking for one - note that the error is actually a few lines
up!
Turning on detailed compilation warnings and output can be very helpful
sometimes - Its in Preferences under "Show Verbose Output During:" and check
the Compilation button. If you ever need to get help from others, be sure to do
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