No suitable Constructor found while compiling

[VJ Anand]

I am trying to extend RDD in java, and when I call the parent constructor,
it gives the error: no suitable constructor found for RDD (SparkContext,
Seq, ClassTag<Object>).

 Here is the snippet of the code:

class QueryShard extends RDD<Tuple> {

----

sc (sc, (Seq)new ArrayBuffer<Dependency<?>>,
ClassTag$.MODULE$.apply(Tuple.class);

}

Compiler error: no suitable constructor found for RDD (SparkContext, Seq,
ClassTag<Object>)

Any thoughts? pointers..

Thanks
VJ