Preview mode must have started before you can take a picture

[salveta]

Hi, I've installed the app and get this error when try to take a photo

E/AndroidRuntime: FATAL EXCEPTION: main
Process: io.github.froger.instamaterial, PID: 1803
java.lang.IllegalStateException: Preview mode must have started before you can take a picture
at com.commonsware.cwac.camera.CameraView.takePicture(CameraView.java:331)
at com.commonsware.cwac.camera.CameraView.takePicture(CameraView.java:279)
at io.github.froger.instamaterial.ui.activity.TakePhotoActivity.onTakePhotoClick(TakePhotoActivity.java:153)
at io.github.froger.instamaterial.ui.activity.TakePhotoActivity_ViewBinding$1.doClick(TakePhotoActivity_ViewBinding.java:41)
at butterknife.internal.DebouncingOnClickListener.onClick(DebouncingOnClickListener.java:22)
at android.view.View.performClick(View.java:5265)
at android.view.View$PerformClick.run(View.java:21534)
at android.os.Handler.handleCallback(Handler.java:815)
at android.os.Handler.dispatchMessage(Handler.java:104)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5737)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)