llvm dev - Oct 2015 - Function return type does not match operand type of return inst!

This is a verifier check.But i am not getting how to resolve this.Do i need
to change the function return type or some thing else.

ValueToValueMapTy VMap;
    BasicBlock *clonedBlock =CloneBasicBlock(bb, VMap, ".tr",
bb->getParent());
std::cout<<"clone done"<<"\n";
       TerminatorInst *merge_term=bb->getTerminator();
std::cout<<"got terminator"<<"\n";
  TerminatorInst *new_term=clonedBlock->getTerminator();
  errs()<<"new terminator instuction in
perf:"<<*new_term<<"\n";
                  //Perform the ReMapping of Clonedinstructions
                  for (BasicBlock::iterator I = clonedBlock->begin(); I
!clonedBlock->end(); ++I)
                    {
                      //Loop over all the operands of the instruction
                      for (unsigned op=0, E = I->getNumOperands(); op != E;
++op)
                        {
                          const Value *Op = I->getOperand(op);
                          //Get it out of the value map
                          Value *V = VMap[Op];
                          //If not in the value map, then its outside our
trace so ignore
                          if(V != 0)
                            I->setOperand(op,V);
                        }
                    }
        merge_term->setOperand(0,clonedBlock);
std::cout<<"set terminator"<<"\n";

this is my pass
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On 15 October 2015 at 01:08, Priyanka Bamne via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
>         merge_term->setOperand(0,clonedBlock);
This seems to be assuming that all basic block terminators will be an
unconditional branch. Judging by the error message, you're applying it
to one with a ret instead and converting it to "ret label %clonedBB".

Cheers.

Tim.