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Attempt to invoke virtual method 'android.os.Bundle android.content.ContentProviderClient.call(java.lang.String, java.lang.String, android.os.Bundle)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Bundle android.content.ContentProviderClient.call(java.lang.String, java.lang.String, android.os.Bundle)' on a null object reference	at android.provider.DocumentsContract.deleteDocument(DocumentsContract.java:987)	at android.provider.DocumentsContract.deleteDocument(DocumentsContract.java:971)	at com.test.example.ResultActivity.onActivityResult(SourceFile:364)	at android.app.Activity.dispatchActivityResult(Activity.java:6177)	at android.app.ActivityThread.deliverResults(ActivityThread.java:3551)	at android.app.ActivityThread.handleSendResult(ActivityThread.java:3598)	at android.app.ActivityThread.access$1300(ActivityThread.java:147)	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1330)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:135)	at android.app.ActivityThread.main(ActivityThread.java:5253)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)