App is crasing

[ArindomGhosh]

HI, I downloaded your project and ran it on my emulator: Nexux 4 API 22, it only worked for first time and then crashing on clicking Launch Camera Button.

Below is the stack:

FATAL EXCEPTION: main
Process: com.wajahatkarim3.longimagecamera.demo, PID: 24782
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.wajahatkarim3.longimagecamera.demo/com.wajahatkarim3.longimagecamera.LongImageCameraActivity}: java.lang.RuntimeException: startPreview failed
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.RuntimeException: startPreview failed
at android.hardware.Camera.startPreview(Native Method)
at com.google.android.cameraview.Camera1.start(Camera1.java:95)
at com.google.android.cameraview.CameraView.start(CameraView.java:259)
at com.wajahatkarim3.longimagecamera.LongImageCameraActivity.checkForCameraPermission(LongImageCameraActivity.java:247)
at com.wajahatkarim3.longimagecamera.LongImageCameraActivity.onCreate(LongImageCameraActivity.java:117)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387) 
at android.app.ActivityThread.access$800(ActivityThread.java:151) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:135) 
at android.app.ActivityThread.main(ActivityThread.java:5254) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)