I've worked on this project, as part of my PhD, for about one year, the goal is to find out how often certain "entities" are mentioned in some rss feed. Now, I thought I had finished, but when I try the skethces very hard, I've encountered some problems.
The first problem is that when no name of the list.txt file is present in the rss-feed i receive an error; is there a way to fix this?
Then, I have noticedsome delays in the execution and some trouble with the controlP5 button on the bottom; I've used this button to select the different rss-feed to analyze.
Now, please can you help me understand where I have to correct the code?

here you can download mySketch