you show a photo ? snapshot? of what program ? webpage? ( you call “reader” ?)
if that is a webpage with a editor using a file
sketch.js
you might want to write a
p5.js code?
your variables ( PVector float ) and functions ( void )
come from a
JAVA code
please give more details what you try to do.
please note that this forum tries to help with BOTH,
but what we look for is the header… where you selected Processing ( not p5.js )
and also your code looks like Processing JAVA
so what we expect is that you have installed on your computer Processing 3.5.3 and use JAVA Mode.
if you ref to this video
you also see that he work in the processing IDE ( old version )