JakeWharton/ActionBarSherlock — comment on commit 2e1e18cb24299bfa3ed8b26262565a9d1ac9df37
File:  line 0
By iNoles:

Would it be best if you do SherlockFragment extends Fragment to avoid java.lang.IllegalArgumentException: already added: Landroid/support/v4/app/FragmentState under dex?