How do I set the current point in a CG graphics context?

Question

When running the code below in the iphone simulator I get the error : CGContextClosePath: no current point. Why is the current point not being set? Or is the context not set to the correct state?

    CGContextBeginPath(ctx);

  CGMutablePathRef pathHolder;

  pathHolder = CGPathCreateMutable();

  //move to point for the initial point
  NSLog(@"Drawing a state point %f, %f", [[holder.points objectAtIndex:0] floatValue], 
  [[holder.points objectAtIndex:1] floatValue]);
  CGPathMoveToPoint(pathHolder, NULL, [[holder.points objectAtIndex:0] floatValue], 
        [[holder.points objectAtIndex:1] floatValue]);

  for(int x = 2; x < [holder.points count] - 1; x += 2)
  {
   NSLog(@"Drawing a state point %f, %f", [[holder.points objectAtIndex:x] floatValue], 
      [[holder.points objectAtIndex:(x+1)] floatValue]);
   CGPathAddLineToPoint(pathHolder, NULL, [[holder.points objectAtIndex:x] floatValue], 
         [[holder.points objectAtIndex:(x+1)] floatValue]);
  }
  CGContextClosePath(ctx);

  CGContextFillPath(ctx);