What is the simplest way to remove lines from one file matched with lines from another file?

Question

Accepted Answer

seems the simplest. But you should do performance tests with smaller files first. (I agree with soandos' comment that such big files might need a dedicated solution.)

What is the simplest way to remove lines from one file matched with lines from another file?

Problem

Error Output

1 Fix

Fix for: What is the simplest way to remove lines from one file matched with lines from another file?

Environment