I have seen a previous discussion on this. The solution was to use Java 7 instead of Java 8.
Just in case you forgot or did not know, you have to actually run the scenario and have something stored before a '.csv' file is created.
Yeah, only my high scores folders have it. But I ran setString() and it didn't open...
It is not enough to run 'setString' -- you need to run 'store'.
Yeah, I did that too, but now it works, the code was unreachable.