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java.lang.IncompatibleClassChangeError: android/content/SharedPreferences$Editor

12-22 10:05:42.238 17815-17815/com.euler.andfix D/ActivityThread: setTargetHeapUtilization:0.75 12-22 10:05:42.238 17815-17815/com.euler.andfix D/ActivityThread ...
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NullPointerException: Attempt to invoke interface method 'SharedPreferences.getBoolean(java.lang.String, boolean)' on a null object reference #17

Hi, I was getting NullPointerException Caused by java.lang.NullPointerException: Attempt to invoke interface method 'boolean android.content.SharedPreferences.getBoolean (java.lang.String, boolean)' ...