Hello, i am trying to create new project in the beginning of the course ,and it requires to set the app folder,is the Styling Learning Path project in Calypso,but i receive an error. I’m using 9.13.0 build 43286 version. Also,when i try to configure Calypso,i can’t access this page ,i receive the 404 error. Follow the instructions in the documentation to set it up https://docs.mendix.com/howto/front-end/Calypso#1-introduction
Since you are using 9.13.0 there is no need to configure calypso. The sass will be compiled automatically . You should use calypso when you are using older versions of mendix.