(stack trace truncated; use '--show-trace' to show the full, detailed trace)

error: Refusing to evaluate package 'a-0' in /nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-default.nix:11 because it has an invalid meta attrset:
  - a.meta.problems.invalid: Problem kind invalid, inferred from the problem name, is invalid; expected enum<removal,deprecated,broken>. You can specify an explicit problem kind with `a.meta.problems.invalid.kind`
