INTERNAL COMPILER ERROR

 function OnCollisionEnter(collideswithtable:Collision)
 {
 
      if(collideswithtable.collider.tag=="table")
      {
            if(isSoundOn)
            {
                audio.clip=P2HitTable;
                Debug.Log("playing sound");
                audio.Play();
 //               yield WaitForSeconds(2);
                audio.Stop();
                isSoundOn=false;
            }
       }
 }

This is the code which shows up a message on uncommenting the yield line in Oncollision enter.I don't think there is something wrong in this code . I d like to state that this only shows up in my network integrated scripts ,i'm using appwarp sdk and the sdk is perfect that's what i presume .my scripts are made up in javascript and the sdk is in csharp ,i'm referencing my javascipts in sdk csharp files. This is my first question on this site and i hope there will be people to help. thank you .