DialogQuestionExpansion Before you run Put "glove.6B.50d.txt" file in src/main/resources/dataFile/. Download link Install Python env Install python version=3.7.*. Link Install SpaCy. Link $ pip install -U pip setuptools wheel $ pip install -U spacy $ python -m spacy download en_core_web_lg Install NeuralCoref. Link $ pip install neuralcoref