java.lang.RuntimeException

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  • java.lang.RuntimeException: Unable to start activity ComponentInfo{benlab.app1ben/benlab.app1ben.game_page}: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.util.Random.nextInt()' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2464) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2524) at android.app.ActivityThread.access$900(ActivityThread.java:154) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1391) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:234) at android.app.ActivityThread.main(ActivityThread.java:5526) 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: Attempt to invoke virtual method 'int java.util.Random.nextInt()' on a null object reference at benlab.app1ben.game_page.newProblem(game_page.java:47) at benlab.app1ben.game_page.onCreate(game_page.java:33) at android.app.Activity.performCreate(Activity.java:6285) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2417) ... 9 more
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