No module named num2words in worker error log

/home/frappe/frappe-bench/env/bin/python: No module named num2words
/home/frappe/frappe-bench/env/bin/python: No module named num2words
/home/frappe/frappe-bench/env/bin/python: No module named num2words
/home/frappe/frappe-bench/env/bin/python: No module named num2words
/home/frappe/frappe-bench/env/bin/python: No module named num2words

In worker error log… 502 bad gateway error in browser

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