Simulink building error

Building error when following starter instructions on page https://create.arduino.cc/edu/courses/mod/book/view.php?id=83&chapterid=113

It is said that
C:/ProgramData/MATLAB/SupportPackages/R2018b/toolbox/target/supportpackages/arduinobase/src/MW_PWM.cpp
系统找不到指定的路径。

However, I can find the file in the folder shown above.

Please let me know what happened and how to solve the problem. Thank you.