Got exception: fragment already active

Reading the setArguments(Bundle args) source will help you understand:

/**
* Supply the construction arguments for this fragment.  This can only
* be called before the fragment has been attached to its activity; that
* is, you should call it immediately after constructing the fragment.  The
* arguments supplied here will be retained across fragment destroy and
* creation.
*/
public void setArguments(Bundle args) {

    if (mIndex >= 0) {
        throw new IllegalStateException("Fragment already active");
    }
    mArguments = args;
}

You cannot use setArguments(Bundle args) again in your code on the same Fragment. What you want to do I guess is either create a new Fragment and set the arguments again. Or you can use getArguments() and then use the put method of the bundle to change its values.