Hi again,
Another effort used the correct void statements to get past compile, see copy of sketch used.
However, even though no red error message posted on upload, two lines were presented:
Invalid library found in C:\Users\wchudyk\Documents\Arduino\libraries\EnviroDIY_Workshops_Online-main: no headers files (.h) found in C:\Users\wchudyk\Documents\Arduino\libraries\EnviroDIY_Workshops_Online-main
Invalid library found in C:\Users\wchudyk\Documents\Arduino\libraries\libraries: no headers files (.h) found in C:\Users\wchudyk\Documents\Arduino\libraries\libraries
and the serial output was as shown in the attached screenshot.
Your suggestions are welcome,
W