UnsupportedOperationException at java.util.AbstractList.add

Question

I\'m having issues getting a block of code to run properly. I\'m not entirely sure WHAT this code does (I\'m trying to get a plugin that\'s out of date to work properly with

Answer 1

In my case I had used:

List removeFilesList= Collections.emptyList();

which made my File arraylist abstract. Used instead:

List removeFilesList= new ArrayList<>();

And the error was fixed.