What solver should I use, since latest code does not include IPCS yet all the examples do?

Traceback (most recent call last):
File "/IdeaProjects/hydrogym/examples/ppo/cyl.py", line 53, in
ppo.ppo(
File "/IdeaProjects/hydrogym/examples/ppo/ppo.py", line 361, in ppo
env = env_fn()
File "/IdeaProjects/hydrogym/examples/ppo/cyl.py", line 54, in
lambda: gym.make("Cylinder-v0", env_config=env_config),
File "/home/firedrake/firedrake/lib/python3.10/site-packages/gym/envs/registration.py", line 640, in make
env = env_creator(**_kwargs)
File "/IdeaProjects/hydrogym/examples/ppo/cyl.py", line 17, in init
"solver": hydrogym.firedrake.IPCS,
AttributeError: module 'hydrogym.firedrake' has no attribute 'IPCS'