error message

11-13 15:44:04.552 3081-3081/com.test.api.api E/AndroidRuntime: FATAL EXCEPTION: main
                                                                Process: com.test.api.api, PID: 3081
                                                                java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.api.api/com.test.api.api.Activity.Input_Jurnal}: java.lang.NullPointerException: storage == null
                                                                    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2455)
                                                                    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2515)
                                                                    at android.app.ActivityThread.access$1000(ActivityThread.java:154)
                                                                    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1379)
                                                                    at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                    at android.os.Looper.loop(Looper.java:157)
                                                                    at android.app.ActivityThread.main(ActivityThread.java:5555)
                                                                    at java.lang.reflect.Method.invoke(Native Method)
                                                                    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:745)
                                                                    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:635)
                                                                    at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:118)
                                                                 Caused by: java.lang.NullPointerException: storage == null
                                                                    at java.util.Arrays$ArrayList.<init>(Arrays.java:38)
                                                                    at java.util.Arrays.asList(Arrays.java:155)
                                                                    at android.widget.ArrayAdapter.<init>(ArrayAdapter.java:137)
                                                                    at com.test.api.api.Activity.Input_Jurnal.onCreate(Input_Jurnal.java:93)
                                                                    at android.app.Activity.performCreate(Activity.java:6357)
                                                                    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108)
                                                                    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2408)
                                                                    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2515)
                                                                    at android.app.ActivityThread.access$1000(ActivityThread.java:154)
                                                                    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1379)
                                                                    at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                    at android.os.Looper.loop(Looper.java:157)
                                                                    at android.app.ActivityThread.main(ActivityThread.java:5555)
                                                                    at java.lang.reflect.Method.invoke(Native Method)
                                                                    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:745)
                                                                    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:635)
                                                                    at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:118)