Call Activity from BaseGameActirity

Call Activity from BaseGameActirity

I am developing a game using andengine so I am extending my main activity
from BaseGameActivity. I have also implemented SceneManager. now from
within scenemanager, I want to call a class that extends 'Activity' (not
BaseGameActivity) I am using following code to call the class from my
SceneManager
activity.startActivity(new Intent(activity, FbConnect.class)); //
Error line
activity.finish();
where 'activity' is an object of my MainActivity class which extends
BaseGameActivity.
now my problem is that I am getting a nullpointerexception on the above
mentioned line (see commented code).
following is my logcat output commented line in above code is line# 118 in
SceneManager.
09-14 22:52:32.035: E/AndroidRuntime(22385): FATAL EXCEPTION: UpdateThread
09-14 22:52:32.035: E/AndroidRuntime(22385): java.lang.NullPointerException
09-14 22:52:32.035: E/AndroidRuntime(22385): at
android.content.ComponentName.<init>(ComponentName.java:75)
09-14 22:52:32.035: E/AndroidRuntime(22385): at
android.content.Intent.<init>(Intent.java:2857)
09-14 22:52:32.035: E/AndroidRuntime(22385): at
com.sohi.tech.rollball.SceneManager.showFbActivity(SceneManager.java:118)
09-14 22:52:32.035: E/AndroidRuntime(22385): at
com.sohi.tech.rollball.MainMenuScene.onMenuItemClicked(MainMenuScene.java:93)
09-14 22:52:32.035: E/AndroidRuntime(22385): at
org.andengine.entity.scene.menu.MenuScene.onAreaTouched(MenuScene.java:139)
09-14 22:52:32.035: E/AndroidRuntime(22385): at
org.andengine.entity.scene.Scene.onAreaTouchEvent(Scene.java:413)
09-14 22:52:32.035: E/AndroidRuntime(22385): at
org.andengine.entity.scene.Scene.onSceneTouchEvent(Scene.java:357)
09-14 22:52:32.035: E/AndroidRuntime(22385): at
org.andengine.entity.scene.CameraScene.onSceneTouchEvent(CameraScene.java:64)
09-14 22:52:32.035: E/AndroidRuntime(22385): at
org.andengine.entity.scene.Scene.onChildSceneTouchEvent(Scene.java:420)
09-14 22:52:32.035: E/AndroidRuntime(22385): at
org.andengine.entity.scene.Scene.onSceneTouchEvent(Scene.java:338)
09-14 22:52:32.035: E/AndroidRuntime(22385): at
org.andengine.engine.Engine.onTouchScene(Engine.java:452)
09-14 22:52:32.035: E/AndroidRuntime(22385): at
org.andengine.engine.Engine.onTouchEvent(Engine.java:438)
09-14 22:52:32.035: E/AndroidRuntime(22385): at
org.andengine.input.touch.controller.BaseTouchController$TouchEventRunnablePoolItem.run(BaseTouchController.java:102)
09-14 22:52:32.035: E/AndroidRuntime(22385): at
org.andengine.util.adt.pool.RunnablePoolUpdateHandler.onHandlePoolItem(RunnablePoolUpdateHandler.java:54)
09-14 22:52:32.035: E/AndroidRuntime(22385): at
org.andengine.util.adt.pool.RunnablePoolUpdateHandler.onHandlePoolItem(RunnablePoolUpdateHandler.java:1)
09-14 22:52:32.035: E/AndroidRuntime(22385): at
org.andengine.util.adt.pool.PoolUpdateHandler.onUpdate(PoolUpdateHandler.java:88)
09-14 22:52:32.035: E/AndroidRuntime(22385): at
org.andengine.input.touch.controller.BaseTouchController.onUpdate(BaseTouchController.java:62)
09-14 22:52:32.035: E/AndroidRuntime(22385): at
org.andengine.engine.Engine.onUpdate(Engine.java:584)
09-14 22:52:32.035: E/AndroidRuntime(22385): at
org.andengine.engine.LimitedFPSEngine.onUpdate(LimitedFPSEngine.java:56)
09-14 22:52:32.035: E/AndroidRuntime(22385): at
org.andengine.engine.Engine.onTickUpdate(Engine.java:548)
09-14 22:52:32.035: E/AndroidRuntime(22385): at
org.andengine.engine.Engine$UpdateThread.run(Engine.java:820)