이번에 졸작으로 안드로이드앱을 만들고 있었는데

액티비티를 실행하니 이와같은 에러가 나왔습니다.

3시간동안 해석해도 안되서......

도와주세요.ㅠㅠ

FATAL EXCEPTION: main

10-31 13:09:59.502: E/AndroidRuntime(24156): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.daegu.palgongmountaintour/com.daegu.palgongmountaintour.olleway_activity}: java.lang.NullPointerException

at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2110)

at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2135)

at android.app.ActivityThread.access$700(ActivityThread.java:143)

at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1241)

at android.os.Handler.dispatchMessage(Handler.java:99)

at android.os.Looper.loop(Looper.java:137)

at android.app.ActivityThread.main(ActivityThread.java:4950)

at java.lang.reflect.Method.invokeNative(Native Method)

at java.lang.reflect.Method.invoke(Method.java:511)

at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:997)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:764)

at dalvik.system.NativeStart.main(Native Method)

Caused by: java.lang.NullPointerException

at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:224)

at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164)

at com.daegu.palgongmountaintour.palgong_DBhander.<init>(palgong_DBhander.java:18)

at com.daegu.palgongmountaintour.olleway_activity.onCreate(olleway_activity.java:26)

at android.app.Activity.performCreate(Activity.java:5177)

at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)

at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2074)