Why did code stop working?

After an edit that used an edited version of a duplicated method using 2018 1.1 my code elicited a “file not found” message when I tried to run it on the Pi 3B+. The original method was no longer called in the code. The ls command lists the compiled file name in white, whereas files that work are shown in green. What is the significance of that?

I got the code working again by deleting the original unused method. It was calling ChartDirector code, which wasn’t producing the expected legends and titles, although the data was being displayed correctly. I had kept the original code as a reference as I was exploring the problem. I still haven’t figured out why the ChartDirector code is not working.

Check the permisssions of the files. I bet one of them is missing the read flag.