Gridsearch nearest_neighbor not working

[Liebeck]

ValueError: Invalid parameter nearest_neghbor for estimator Pipeline(steps=[('nearest_neighbor', RadiusNeighborsRegressor(algorithm='auto', leaf_size=30, metric='minkowski',
metric_params=None, p=2, radius=0.4, weights='distance'))]). Check the list of available parameters with estimator.get_params().keys().