Java class can't convert to kotlin

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1

I have a generic class, like this

public abstract class BaseSimpleRecyclerAdapter<Model,
        VH extends BaseSimpleRecyclerAdapter.BaseViewHolder> extends RecyclerView.Adapter<VH>
{
        public abstract class BaseViewHolder extends RecyclerView.ViewHolder
        {
              ///
        }
}

i want to rewrite it by kotlin, but there is a problem

abstract class BaseRecyclerAdapter<Model, Holder: BaseRecyclerAdapter.BaseViewHolder>
        : RecyclerView.Adapter<Holder>()
{
        abstract inner class BaseViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView)
        {
                ///
        }
}