Nix derivation fails on Nixos 19.03

[Softsapiens]

Hi, I'm trying to run your project on Nixos 19.03, but I'm getting this:

$ nix-shell shell.nix --show-trace 
error: while evaluating the attribute 'buildInputs' of the derivation 'shell' at /home/dpm/code/haskell/musikell/shell.nix:9:3:
while evaluating 'chooseDevOutputs' at /nix/store/qj999vxkcfw5hgsj5dqdgdmadss1m4sm-nixos-19.03.173122.e2ad04c513e/nixos/lib/attrsets.nix:474:22, called from undefined position:
while evaluating the file '/home/dpm/code/haskell/musikell/release.nix':
while evaluating 'callPackage' at /nix/store/qj999vxkcfw5hgsj5dqdgdmadss1m4sm-nixos-19.03.173122.e2ad04c513e/nixos/pkgs/development/haskell-modules/make-package-set.nix:114:22, called from /home/dpm/code/haskell/musikell/release.nix:4:3:
while evaluating 'callPackageWithScope' at /nix/store/qj999vxkcfw5hgsj5dqdgdmadss1m4sm-nixos-19.03.173122.e2ad04c513e/nixos/pkgs/development/haskell-modules/make-package-set.nix:74:37, called from /nix/store/qj999vxkcfw5hgsj5dqdgdmadss1m4sm-nixos-19.03.173122.e2ad04c513e/nixos/pkgs/development/haskell-modules/make-package-set.nix:114:28:
while evaluating 'makeOverridable' at /nix/store/qj999vxkcfw5hgsj5dqdgdmadss1m4sm-nixos-19.03.173122.e2ad04c513e/nixos/lib/customisation.nix:67:24, called from /nix/store/qj999vxkcfw5hgsj5dqdgdmadss1m4sm-nixos-19.03.173122.e2ad04c513e/nixos/pkgs/development/haskell-modules/make-package-set.nix:97:8:
while evaluating 'drvScope' at /nix/store/qj999vxkcfw5hgsj5dqdgdmadss1m4sm-nixos-19.03.173122.e2ad04c513e/nixos/pkgs/development/haskell-modules/make-package-set.nix:87:18, called from /nix/store/qj999vxkcfw5hgsj5dqdgdmadss1m4sm-nixos-19.03.173122.e2ad04c513e/nixos/lib/customisation.nix:69:12:
while evaluating anonymous function at /home/dpm/code/haskell/musikell/default.nix:1:1, called from /nix/store/qj999vxkcfw5hgsj5dqdgdmadss1m4sm-nixos-19.03.173122.e2ad04c513e/nixos/pkgs/development/haskell-modules/make-package-set.nix:87:27:
while evaluating 'callPackage' at /nix/store/qj999vxkcfw5hgsj5dqdgdmadss1m4sm-nixos-19.03.173122.e2ad04c513e/nixos/pkgs/development/haskell-modules/make-package-set.nix:114:22, called from /home/dpm/code/haskell/musikell/default.nix:2:1:
while evaluating 'callPackageWithScope' at /nix/store/qj999vxkcfw5hgsj5dqdgdmadss1m4sm-nixos-19.03.173122.e2ad04c513e/nixos/pkgs/development/haskell-modules/make-package-set.nix:74:37, called from /nix/store/qj999vxkcfw5hgsj5dqdgdmadss1m4sm-nixos-19.03.173122.e2ad04c513e/nixos/pkgs/development/haskell-modules/make-package-set.nix:114:28:
while evaluating 'makeOverridable' at /nix/store/qj999vxkcfw5hgsj5dqdgdmadss1m4sm-nixos-19.03.173122.e2ad04c513e/nixos/lib/customisation.nix:67:24, called from /nix/store/qj999vxkcfw5hgsj5dqdgdmadss1m4sm-nixos-19.03.173122.e2ad04c513e/nixos/pkgs/development/haskell-modules/make-package-set.nix:97:8:
while evaluating 'drvScope' at /nix/store/qj999vxkcfw5hgsj5dqdgdmadss1m4sm-nixos-19.03.173122.e2ad04c513e/nixos/pkgs/development/haskell-modules/make-package-set.nix:87:18, called from /nix/store/qj999vxkcfw5hgsj5dqdgdmadss1m4sm-nixos-19.03.173122.e2ad04c513e/nixos/lib/customisation.nix:69:12:
anonymous function at /home/dpm/code/haskell/musikell/musikell.nix:1:1 called without required argument 'morpheus-graphql', at /nix/store/qj999vxkcfw5hgsj5dqdgdmadss1m4sm-nixos-19.03.173122.e2ad04c513e/nixos/pkgs/development/haskell-modules/make-package-set.nix:87:27

Could be related to miss morpheus-graphql haskell package?

Thanks and congrats for the work