S-Function builder fails compilation diagnostics gives "Error using fopen ..."

I followed the very simple and straightforward guide to write an S Function Builder Block here https://www.mathworks.com/matlabcentral/mlc-downloads/downloads/submissions/39354/versions/10/download/zip/DriversGuide.zip and I get the following error when clicking the Build button:

Error using fopen
The file name contains characters that are not contained in the filesystem encoding.
Certain operations may not work as expected.

I have r2018a.

[Walter Roberson]

What is the name you are giving to the S function?

[Tim Darrah]

its name is "test"

[Walter Roberson]

I looked through the various models in the .zip but I could not see anything obvious.

Which model was it that you had open when you did the build ?

[Doug Kaiser]

This is also occurring on my system when trying to build from the built in MATLAB s function builder example model.

 open_system([docroot,'/toolbox/simulink/sfg/examples/sfbuilder_example']);

This only started happening after upgrading to r2018a.

[Doug Kaiser]

This problem does not occur when the exact same thing is tried back on r2017b.

[Johnny Wall]

@Mathworks, is this a bug in R2018A, that S-Function Builder does not work?

Answer 1

[Stefanie Schwarz]

Hi,

please check out the article below to see what we currently know about this error message:

https://www.mathworks.com/matlabcentral/answers/411659-why-do-i-get-error-using-fopen-when-using-s-function-builder-block-in-matlab-r2018a