Due to recent bot attacks we have changed the sign-up process. If you want to participate in our forum please send a message via our contact form. › Forums › OpenLB › General Topics › I can’t run bstep2d › Reply To: I can’t run bstep2d September 30, 2020 at 9:49 am #5187 mathiasKeymaster Post the error message and a screenshot of the files availabe after typing “ll”