java.lang.NullPointerException: Attempt to invoke interface method 'android.content.SharedPreferences$Editor android.content.SharedPreferences.edit()' on a null object reference

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Attempt to invoke interface method 'android.content.SharedPreferences$Editor android.content.SharedPreferences.edit()' on a null object reference
java.lang.NullPointerException: Attempt to invoke interface method 'android.content.SharedPreferences$Editor android.content.SharedPreferences.edit()' on a null object reference
at com.bluefirelabs.apptiva.UserInfoActivity$override.saveGuardianNames(UserInfoActivity.java:374)
at com.bluefirelabs.apptiva.UserInfoActivity$override.static$access$200(UserInfoActivity.java:27)
at com.bluefirelabs.apptiva.UserInfoActivity$override.access$dispatch(UserInfoActivity.java)
at com.bluefirelabs.apptiva.UserInfoActivity.access$200(UserInfoActivity.java:0)
at com.bluefirelabs.apptiva.UserInfoActivity$1$override.onClick(UserInfoActivity.java:112)
at com.bluefirelabs.apptiva.UserInfoActivity$1$override.access$dispatch(UserInfoActivity.java)
at com.bluefirelabs.apptiva.UserInfoActivity$1.onClick(UserInfoActivity.java:0)
at android.view.View.performClick(View.java:5702)
at android.widget.TextView.performClick(TextView.java:10885)
at android.view.View$PerformClick.run(View.java:22533)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7229)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

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