ChildFramgentManager not working inside onActivityResylt in fragment. How to fix?

Question

Android

There is an activity (AcMain), inside this activity there are several fragments, in one of these fragments (FrOne) you need to launch a nested fragment (FrOne__FrNested) after calling onActivityResylt.
Inside FrOne is the following code:

private void clickButton() {
         startActivityForResult(intent, REQUEST_CODE_ADD_VIDEO);
    }

@Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch (requestCode) {
           case REQUEST_CODE_ADD_VIDEO:
              getChildFragmentManager().beginTransaction()
                            .add(layoutForAllFragmentsFR_ONE.getId(), new FrOne_FrNested))
                            .addToBackStack(null)
                           .commit();
            break;
        }
    }

The problem is that with the help of childFragmentManager I cannot add a fragment, but with the help of a regular fragmentManager everything is added normally.
Error when adding using childFM:

E/AndroidRuntime: FATAL EXCEPTION: main
                                                                        Process: com.example.max.sloustep, PID: 1153
                                                                        java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=65538, result=-1, data=Intent { dat=content://media/external/video/media/42964 flg=0x1 }} to activity {com.example.max.sloustep/com.example.max.sloustep.activities.AcMain}: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
                                                                            at android.app.ActivityThread.deliverResults(ActivityThread.java:3852)
                                                                            at android.app.ActivityThread.handleSendResult(ActivityThread.java:3895)
                                                                            at android.app.ActivityThread.access$1600(ActivityThread.java:154)
                                                                            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1445)
                                                                            at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                            at android.os.Looper.loop(Looper.java:148)
                                                                            at android.app.ActivityThread.main(ActivityThread.java:5582)
                                                                            at java.lang.reflect.Method.invoke(Native Method)
                                                                            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
                                                                         Caused by: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
                                                                            at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1842)
                                                                            at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1860)
                                                                            at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:650)
                                                                            at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:609)
                                                                            at com.example.max.sloustep.fragments.FrProfile.onActivityResult(FrProfile.java:311)
                                                                            at android.support.v4.app.FragmentActivity.onActivityResult(FragmentActivity.java:164)
                                                                            at android.app.Activity.dispatchActivityResult(Activity.java:6526)
                                                                            at android.app.ActivityThread.deliverResults(ActivityThread.java:3848)
                                                                            at android.app.ActivityThread.handleSendResult(ActivityThread.java:3895) 
                                                                            at android.app.ActivityThread.access$1600(ActivityThread.java:154) 
                                                                            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1445) 
                                                                            at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                            at android.os.Looper.loop(Looper.java:148) 
                                                                            at android.app.ActivityThread.main(ActivityThread.java:5582) 
                                                                            at java.lang.reflect.Method.invoke(Native Method) 
                                                                            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                                                                            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 

Answer 1

congratulations, you got into the reason why fragments are very much not used, i.e. in a very problematic life cycle. There is no universal solution, i.e. in general, yes. just stop using it.
Google recently published a pack of libs, to simplify the solution of these problems here