[firedrake] Firedrake Install Problem

Dear reader, I tried to install firedrake in my Macbook. I am running the test command: pytest tests/regression/ -k "poisson_strong or stokes_mini or dg_advection" but I get the error message, ModuleNotFoundError: No module named 'pyadjoint' which is strange because 'pyadjoint' is already in the folder. Do you know what maybe goes wrong there? Thanks in advance and best regards, Andreas