QCA with SetMethods package: rob.cases function doesn't run

Hi everyone,

I've been running an fsQCA with the packages SetMethods and QCA and conducting robustness checks. The problem is that I can't get the function rob.cases to run.

I've run through all the required steps (created an Initial Solution, IS2 below, and a test solution, TSn) and all other robustness check functions work...

Help?

The code:
rob.cases(test_sol = TSn, initial_sol = IS2, outcome = "~SOCIALLY.JUST")