Hi, I'm trying out spicedb and playing with some toy schema on the playground. What I want to achieve is to allow runtime grant to any user as long as certain condition is met, on top of direct grant. I'm using caveat to achieve this and came up with: https://play.authzed.com/s/WPKlZtJ2f4Nz/schema. Running validation results in

did not find expected key

error. Does someone know what's wrong? Thanks in advance.