I keep running into this error when running a code after booting up.  The 
code write to certain GPIO under /sys/class/gpio.  It complains:

No such file or directory

I reset the BBB and run `ls` inside /sys/class/gpio.  Apparently, the 
selected GPIO's are not there.  After the aforementioned code is executed 
(and the same errors are thrown), I run `ls` again.  This time, the 
required GPIO's are there.  Could someone explain to me why they do not 
initially exist, and what makes them show up afterwards?  Thank you in 
advance.

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