运行报错

[xfmax]

11-27 13:58:56.448 30018-30018/com.aiseminar.platerecognizer E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.aiseminar.platerecognizer, PID: 30018
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.aiseminar.platerecognizer/com.aiseminar.platerecognizer.ui.CameraActivity}: java.lang.NullPointerException: file == null
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.NullPointerException: file == null
at java.io.FileOutputStream.(FileOutputStream.java:84)
at java.io.FileOutputStream.(FileOutputStream.java:72)
at com.aiseminar.EasyPR.PlateRecognizer.checkAndUpdateModelFile(PlateRecognizer.java:59)
at com.aiseminar.EasyPR.PlateRecognizer.(PlateRecognizer.java:31)
at com.aiseminar.platerecognizer.ui.CameraActivity.onCreate(CameraActivity.java:77)
at android.app.Activity.performCreate(Activity.java:6251)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
at android.app.ActivityThread.-wrap11(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:5417) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)