Simulink - Working dimension not supported

I'm getting the following error when running a model in Simulink

An error occurred while running the simulation and the simulation was terminated
Caused by:
* The working dimension was selected automatically, is variable-length, and has length 1 at run 
  time. This is not supported. Manually select the working dimension by supplying the DIM 
  argument.

This error only occurred after adding a new MATLAB function block which reads data from a spreadsheet, but I have implemented several of these without issue already. As with most of Simulink's incomprehensable error messages there's no good indication of what is the cause of the error. Any help would be greatly appreciated.

Answer 1

[Chao James]

C1 = [0 2 3];
S = max(C1); 

I've figured out the cause of the problem, in my program, this problem is generated by the above code. and when I change it to :

S = max(C1,[],2); 

then the problem is soved.

Hope it can help you!