error: undefined variable 'nbdime'

overlays.nix

[
/* local pkg (can delete after in upstream)*/
(self: super: {
  })

/* configure pkg */
(self: super: {
  pythonOverrides = python-self: python-super: {
    magma = python-super.callPackage /Computer/packages/magma.nix { };
    pytorch = python-super.callPackage /Computer/packages/pytorch.nix { };
    jsonschema = python-super.callPackage /Computer/packages/jsonschema.nix { };
    nbdime = python-super.callPackage /Computer/packages/nbdime.nix { };
    };
  firefox = super.firefox.override {
    enableAdobeFlash = true;
  };
  numpy = super.numpy.overridePythonAttrs (old: {
    blas = self.mkl;
  });
  pytorch = super.pytorch.overridePythonAttrs
    (old: {
      cudaSupport = true;
      cudatoolkit = self.cudatoolkit_10;
  });
  tensorflow = super.tensorflow.overridePythonAttrs
    (old: { cudaSupport = true; });
  opencv3 = super.opencv3.override {
    enableCuda = true;
    enableFfmpeg = true;
  };
})
]

python.nix

{pkgs, ...}:

let
python = (pkgs.python37.override {packageOverrides = pkgs.pythonOverrides;}).withPackages (ps: with ps; [
  setuptools
  click
  h5py
  ipython
  matplotlib
  moviepy
  nbdime
  numpy
  opencv3
  pandas
  pytorch
  pyyaml
  requests
  scikitimage
  scikitlearn
  scipy
  tqdm
  tensorflow
  wheel
]);
in
{
home.packages = [
  python
];
}