NinjaBlock /sys/devices/virtual/gpio/gpio23/value: No such file or directory

Hi,
if you receive the following Messages while restarting the NinjaBlock Service (stopninja && startninja)

/sys/devices/virtual/gpio/gpio23/value: No such file or directory

or

[System] Sun Jan  5 01:17:07 EST 2014 Flashing Arduino...Pass 1 Failed!
avrdude: stk500_getsync(): not in sync: resp=0xe0

or

`/sys/devices/virtual/gpio/gpio23/*': No such file or directory

Maybe your GPIO Pins are not exported any more…
The following command resolves the issues for me:

echo 23 > /sys/class/gpio/export
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