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java.lang.NullPointerException: 	at com.pi4j.io.gpio.impl.GpioControllerImpl.provisionPin(GpioControllerImpl.java:491)	at com.pi4j.io.gpio.impl.GpioControllerImpl.provisionDigitalInputPin(GpioControllerImpl.java:597)	at com.pi4j.io.gpio.impl.GpioControllerImpl.provisionDigitalInputPin(GpioControllerImpl.java:607)	at besmart_park.Sensor.(Sensor.java:28)	at besmart_park.PostoAuto.(PostoAuto.java:27)	at besmart_park.Start.main(Start.java:56)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:58)