I'm getting Error code 2 with mp3 player V15 sparkfun

If you are getting the same error then you have the same problem, you are trying to play a file that can not be found.
So is your file in root?

Also

SdFatLib only supports 8.3 filenames. Long file names will not work. Use the 'd' menu command to display directory contents of the SdCard. "longfilename.mp3" will be converted to "longfi~1.mp3" . Where one can not predict the value of the 1. The DOS command of "dir \c /x" will list a cross reference, so that you know exactly, what is what.
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