When trying to enroll into a professional education course that only has a paid option such as "Wharton: Selling Ideas: How to Influence Others and Get Your Message to Catch On" an enrollment error is shown.
Payments are not available on mobile. Here are some possible options:
a. Modify https://webview.edx.org/course?type=mobile to not return paid only courses
b. Show a different error message when attempting to enroll in this course