Hello,
Please follow these instructions as a courtesy to this community:
https://discourse.processing.org/faq#format-your-code
I have come across this example before and was able to correct it with some research.
Processing 4.0b7 shows this console message:
After you add the import you will get this error:
A search in this forum for that line 23 (above picture) will find a topic that will give you some insight.
The steps I took worked to resolve this issue:
:)