this derivation will be built:
  /nix/store/bxbv0nlpmsk83lpznzmjzx3jnmp5irva-interpolate-conformance.drv
error: gRPC QueryValidPaths on 'farm.numtide.com:50051' failed: error: substituter 'https://cache.numtide.com' is disabled
error: Cannot build '/nix/store/bxbv0nlpmsk83lpznzmjzx3jnmp5irva-interpolate-conformance.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/yifs43ayl7fkc9jwrmb8pj43vm7y7mi3-interpolate-conformance