how to resolve kinametic over constrain problem

Hi there,
I am working on seating human model. I had attached a steering with two nodes attached right & left side to the steering & given the joint between reference node and steering. I had defined a revolute joint between the steering and reference node & also given the driver for the steering to rotate.
I made the following modification in the seated model:
In joints and driver folder I made the following changes in the drivers for the right arm:
// Drivers for the right arm
// ************************************

//Sterno clavicular joint driver
AnyKinEqSimpleDriver SCDriverRight ={
  AnyKinMeasureOrg &ref1 =....HumanModel.Interface.Right.SternoClavicularProtraction;
  AnyKinMeasureOrg &ref2 =....HumanModel.Interface.Right.SternoClavicularElevation;
  AnyKinMeasureOrg &ref3 =....HumanModel.Interface.Right.SternoClavicularAxialRotation;
  DriverPos = pi/180*{
  //DriverVel = {
   // ..JntVel.Right.SternoClavicularElevation,
   // ..JntVel.Right.SternoClavicularAxialRotation
 DriverVel = {0.0,0.0,0};


//Glenohumeral joint 
AnyKinEqSimpleDriver GHDriverRight={
  AnyKinMeasureOrg &ref1 = ....HumanModel.Interface.Right.GlenohumeralAbduction;

// AnyKinMeasureOrg &ref3 = …HumanModel.Interface.Right.GlenohumeralExternalRotation;

// DriverPos=pi/180*{
//…JntPos.Right.GlenohumeralAbduction //GH joint
// …JntPos.Right.GlenohumeralExternalRotation //GH joint
//DriverVel = pi/180*{
//…JntVel.Right.GlenohumeralAbduction //GH joint
// …JntVel.Right.GlenohumeralExternalRotation //GH joint
// };
// Reaction.Type={Off};

//Elbow pronation driver
//AnyKinEqSimpleDriver ElbowPronationDriverRight={
  //AnyKinMeasureOrg &Elbow =....HumanModel.Interface.Right.ElbowPronation;
 // DriverPos = pi/180*{..JntPos.Right.ElbowPronation };  
 // DriverVel=pi/180*{..JntVel.Right.ElbowPronation };  
 // Reaction.Type={Off};

//Wrist driver 
AnyKinEqSimpleDriver WristDriverRight ={
  AnyKinMeasureOrg &ref1 =....HumanModel.Interface.Right.WristFlexion;
  AnyKinMeasureOrg &ref2 =....HumanModel.Interface.Right.WristAbduction;
  DriverPos = pi/180*{
  DriverVel = pi/180*{

}; //End Right

When I try to run the application it is giving me an the following error
ERROR(OBJ.MCH.KIN2) : C:/D…s/A…r/D…p/A…1/A…n/E…s/S…n/SeatedHuman.main.any : Study : Model is kinematically over-constrained : Position analysis failed : 2 unsolvable constraint(s) found
How to resolve this problem