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Update README.md with useful note to avoid error when working with the 'FEZ HAT driver' #23
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…method to avoid errors later
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During one of the Build 2016 workshops we spent some time trying to figure out why an error occurred when working with the 'FEZ HAT driver'.
It turns out If you continue working with your solution from your previous exercise, you need to comment out 'InitializeGpio()' to avoid this error.
I added a note describing this need to comment out the 'InitializeGpio()' method to avoid errors later.