Movie Rating Prediction using rnn

i am unable to solve this error colab link:https://colab.research.google.com/drive/1hut28AJ173hRhmSgh05WYFp8ELm6uOYW

This error occurs due to key Error which means you are trying to access the key ‘unbelivebly’ which is not already present in the dictionary. Try to use try-except block for line
embedding_matrix_output[ix][jx] = embeddings[X[ix][jx].lower()]

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