Invalid syntax for the "tf" command.

Hi I am getting this error when using the following set of code from the example

mulitpath fading channel example:

for i = 1:numFrames % Display impulse and frequency responses for 2 frames

      % Create random data
      msg = randi([0 1],bitsPerFrame,1);
      % Modulate data
      modSignal = step(hMod,msg);
      % Filter data through channel and show channel responses
      step(hRayChan,modSignal);
  end

I made some changes in terms of speed and sampling rate that is different from the example but the error is a syntax error that is confusing, I have also changed the speed back to the one in the example and the error stills shows up, any thoughts on the cause of this ?

Regards,

Philip

[Philip]

The Rayleigh was not properly configured so please ignore this

question