Android Recycle View LogCat: impossible de trouver une méthode

J'ai utilisé RecyclerView depuis la bibliothèque de support Android. Lorsqu'il est exécuté sur Samsung Galaxy S2 avec Android 4.1.2 (API 16), tous fonctionnent bien, mais dans Logcat je vois des messages:

03-24 I/dalvikvm: DexOpt: illegal method access (call Landroid/support/v7/widget/RecyclerView$ViewHolder;.isUpdated ()Z from Lnet/mytest/TransactionsAdapter$TransactionsAdapterViewHolder;) 03-24 I/dalvikvm: Could not find method android.support.v7.widget.RecyclerView$ViewHolder.isUpdated, referenced from method net.mytest.TransactionsAdapter$TransactionsAdapterViewHolder.access$super 03-24 W/dalvikvm: VFY: unable to resolve virtual method 16775: Landroid/support/v7/widget/RecyclerView$ViewHolder;.isUpdated ()Z 03-24 D/dalvikvm: VFY: replacing opcode 0x6f at 0x0031 03-24 I/dalvikvm: DexOpt: illegal method access (call Landroid/support/v7/widget/RecyclerView$ViewHolder;.flagRemovedAndOffsetPosition (IIZ)V from Lnet/mytest/TransactionsAdapter$TransactionsAdapterViewHolder;) 03-24 I/dalvikvm: Could not find method android.support.v7.widget.RecyclerView$ViewHolder.flagRemovedAndOffsetPosition, referenced from method net.mytest.TransactionsAdapter$TransactionsAdapterViewHolder.access$super 03-24 W/dalvikvm: VFY: unable to resolve virtual method 16759: Landroid/support/v7/widget/RecyclerView$ViewHolder;.flagRemovedAndOffsetPosition (IIZ)V 03-24 D/dalvikvm: VFY: replacing opcode 0x6f at 0x0053 03-24 I/dalvikvm: DexOpt: illegal method access (call Landroid/support/v7/widget/RecyclerView$ViewHolder;.isRemoved ()Z from Lnet/mytest/TransactionsAdapter$TransactionsAdapterViewHolder;) 03-24 I/dalvikvm: Could not find method android.support.v7.widget.RecyclerView$ViewHolder.isRemoved, referenced from method net.mytest.TransactionsAdapter$TransactionsAdapterViewHolder.access$super 03-24 W/dalvikvm: VFY: unable to resolve virtual method 16772: Landroid/support/v7/widget/RecyclerView$ViewHolder;.isRemoved ()Z 03-24 D/dalvikvm: VFY: replacing opcode 0x6f at 0x0058 03-24 I/dalvikvm: DexOpt: illegal method access (call Landroid/support/v7/widget/RecyclerView$ViewHolder;.clearPayload ()V from Lnet/mytest/TransactionsAdapter$TransactionsAdapterViewHolder;) 03-24 I/dalvikvm: Could not find method android.support.v7.widget.RecyclerView$ViewHolder.clearPayload, referenced from method net.mytest.TransactionsAdapter$TransactionsAdapterViewHolder.access$super 03-24 W/dalvikvm: VFY: unable to resolve virtual method 16754: Landroid/support/v7/widget/RecyclerView$ViewHolder;.clearPayload ()V 03-24 D/dalvikvm: VFY: replacing opcode 0x6f at 0x007c 03-24 I/dalvikvm: DexOpt: illegal method access (call Landroid/support/v7/widget/RecyclerView$ViewHolder;.isAdapterPositionUnknown ()Z from Lnet/mytest/TransactionsAdapter$TransactionsAdapterViewHolder;) 03-24 I/dalvikvm: Could not find method android.support.v7.widget.RecyclerView$ViewHolder.isAdapterPositionUnknown, referenced from method net.mytest.TransactionsAdapter$TransactionsAdapterViewHolder.access$super 03-24 W/dalvikvm: VFY: unable to resolve virtual method 16768: Landroid/support/v7/widget/RecyclerView$ViewHolder;.isAdapterPositionUnknown ()Z 03-24 D/dalvikvm: VFY: replacing opcode 0x6f at 0x0086 03-24 I/dalvikvm: DexOpt: illegal method access (call Landroid/support/v7/widget/RecyclerView$ViewHolder;.offsetPosition (IZ)V from Lnet/mytest/TransactionsAdapter$TransactionsAdapterViewHolder;) 03-24 I/dalvikvm: Could not find method android.support.v7.widget.RecyclerView$ViewHolder.offsetPosition, referenced from method net.mytest.TransactionsAdapter$TransactionsAdapterViewHolder.access$super 03-24 W/dalvikvm: VFY: unable to resolve virtual method 16777: Landroid/support/v7/widget/RecyclerView$ViewHolder;.offsetPosition (IZ)V 03-24 D/dalvikvm: VFY: replacing opcode 0x6f at 0x00ad 03-24 I/dalvikvm: DexOpt: illegal method access (call Landroid/support/v7/widget/RecyclerView$ViewHolder;.shouldIgnore ()Z from Lnet/mytest/TransactionsAdapter$TransactionsAdapterViewHolder;) 03-24 I/dalvikvm: Could not find method android.support.v7.widget.RecyclerView$ViewHolder.shouldIgnore, referenced from method net.mytest.TransactionsAdapter$TransactionsAdapterViewHolder.access$super 03-24 W/dalvikvm: VFY: unable to resolve virtual method 16786: Landroid/support/v7/widget/RecyclerView$ViewHolder;.shouldIgnore ()Z 03-24 D/dalvikvm: VFY: replacing opcode 0x6f at 0x00b9 03-24 I/dalvikvm: DexOpt: illegal method access (call Landroid/support/v7/widget/RecyclerView$ViewHolder;.setFlags (II)V from Lnet/mytest/TransactionsAdapter$TransactionsAdapterViewHolder;) 03-24 I/dalvikvm: Could not find method android.support.v7.widget.RecyclerView$ViewHolder.setFlags, referenced from method net.mytest.TransactionsAdapter$TransactionsAdapterViewHolder.access$super 03-24 W/dalvikvm: VFY: unable to resolve virtual method 16782: Landroid/support/v7/widget/RecyclerView$ViewHolder;.setFlags (II)V 03-24 D/dalvikvm: VFY: replacing opcode 0x6f at 0x00d4 03-24 I/dalvikvm: DexOpt: illegal method access (call Landroid/support/v7/widget/RecyclerView$ViewHolder;.addChangePayload (Ljava/lang/Object;)V from Lnet/mytest/TransactionsAdapter$TransactionsAdapterViewHolder;) 03-24 I/dalvikvm: Could not find method android.support.v7.widget.RecyclerView$ViewHolder.addChangePayload, referenced from method net.mytest.TransactionsAdapter$TransactionsAdapterViewHolder.access$super 03-24 W/dalvikvm: VFY: unable to resolve virtual method 16751: Landroid/support/v7/widget/RecyclerView$ViewHolder;.addChangePayload (Ljava/lang/Object;)V 03-24 D/dalvikvm: VFY: replacing opcode 0x6f at 0x00dc 

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