Same error, but I'm using Obi Fluid. This is pretty serious because these errors disallow you from creating a new Lightweight Render Pipeline.
EDIT:
Strange; the error seems to be gone after re-importing Obi Fluid from the Asset Store. Perhaps it would work as well with Obi Rope, for you other users here that are having similar issues.
EDIT:
Strange; the error seems to be gone after re-importing Obi Fluid from the Asset Store. Perhaps it would work as well with Obi Rope, for you other users here that are having similar issues.