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.activities.MainActivity$4.onTextChanged(MainActivity.java:265)
	at android.widget.TextView.sendOnTextChanged(TextView.java:10545)
	at android.widget.TextView.handleTextChanged(TextView.java:10635)
	at android.widget.TextView$ChangeWatcher.onTextChanged(TextView.java:13389)
	at android.text.SpannableStringBuilder.sendTextChanged(SpannableStringBuilder.java:1267)
	at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:576)
	at android.text.SpannableStringBuilder.delete(SpannableStringBuilder.java:230)
	at android.text.SpannableStringBuilder.delete(SpannableStringBuilder.java:37)
	at android.text.method.BaseKeyListener.backspaceOrForwardDelete(BaseKeyListener.java:370)
	at android.text.method.BaseKeyListener.backspace(BaseKeyListener.java:71)
	at android.text.method.BaseKeyListener.onKeyDown(BaseKeyListener.java:479)
	at android.text.method.NumberKeyListener.onKeyDown(NumberKeyListener.java:148)
	at android.widget.TextView.doKeyDown(TextView.java:8440)
	at android.widget.TextView.onKeyDown(TextView.java:8197)
	at android.view.KeyEvent.dispatch(KeyEvent.java:2820)
	at android.view.View.dispatchKeyEvent(View.java:13398)
	at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1928)
	at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1928)
	at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1928)
	at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1928)
	at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1928)
	at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1928)
	at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1928)
	at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1928)
	at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1928)
	at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1928)
	at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1928)
	at com.android.internal.policy.DecorView.superDispatchKeyEvent(DecorView.java:453)
	at com.android.internal.policy.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1839)
	at android.app.Activity.dispatchKeyEvent(Activity.java:3953)
	at androidx.core.app.ComponentActivity.superDispatchKeyEvent(ComponentActivity.java:122)
	at androidx.core.view.KeyEventDispatcher.dispatchKeyEvent(KeyEventDispatcher.java:84)
	at androidx.core.app.ComponentActivity.dispatchKeyEvent(ComponentActivity.java:140)
	at androidx.appcompat.app.AppCompatActivity.dispatchKeyEvent(AppCompatActivity.java:599)
	at androidx.appcompat.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:59)
	at androidx.appcompat.app.AppCompatDelegateImpl$AppCompatWindowCallback.dispatchKeyEvent(AppCompatDelegateImpl.java:3068)
	at com.android.internal.policy.DecorView.dispatchKeyEvent(DecorView.java:367)
	at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:5600)
	at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5463)
	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4966)
	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5019)
	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4985)
	at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:5125)
	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4993)
	at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:5182)
	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4966)
	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5019)
	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4985)
	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4993)
	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4966)
	at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:7782)
	at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:7751)
	at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:7702)
	at android.view.ViewRootImpl$ViewRootHandler.handleMessage(ViewRootImpl.java:4734)
	at android.os.Handler.dispatchMessage(Handler.java:107)
	at android.os.Looper.loop(Looper.java:214)
	at android.app.ActivityThread.main(ActivityThread.java:7436)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:980)