Metric is neither callable, nor a recognised string issue

Question

i am using UMAP method from the following link :metrix in UMAP

here is code fragment :

import umap
embedding = umap.UMAP(n_components=2, metric='hellinger').fit(word_doc_matrix)

where word_doc_matrix is calculated using CountVectorizer command

vectorizer =CountVectorizer(min_df=5,stop_words='english')
word_doc_matrix =vectorizer.fit_transform(dataset.data)

i have searched about this issue and saw the following link : information about issue

so how can i fix it?