java.lang.RuntimeException: Unable to create service com.entitcs.office_attendance.model_classes.GPSTracker: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.net.NetworkInfo.isAvailable()' on a null object reference
	at android.app.ActivityThread.handleCreateService(ActivityThread.java:4751)
	at android.app.ActivityThread.-$$Nest$mhandleCreateService(Unknown Source:0)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2312)
	at android.os.Handler.dispatchMessage(Handler.java:106)
	at android.os.Looper.loopOnce(Looper.java:240)
	at android.os.Looper.loop(Looper.java:351)
	at android.app.ActivityThread.main(ActivityThread.java:8377)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:584)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1013)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.net.NetworkInfo.isAvailable()' on a null object reference
	at com.entitcs.office_attendance.model_classes.ValidationClass.isInternetAvailable(ValidationClass.java:25)
	at com.entitcs.office_attendance.model_classes.GPSTracker.sendGPSStatusToServer(GPSTracker.java:203)
	at com.entitcs.office_attendance.model_classes.GPSTracker.<init>(GPSTracker.java:108)
	at com.entitcs.office_attendance.model_classes.GPSTracker.onCreate(GPSTracker.java:96)
	at android.app.ActivityThread.handleCreateService(ActivityThread.java:4726)
	... 9 more