when i run npm run develop i get this error (i’m using heroku for deployement …)
debug: 
Server wasn’t able to start properly.
error: Knex: Timeout acquiring a connection. The pool is probably full. Are you missing a .transacting(trx) call
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There can be multiple reason for this error. Can you upgrade your strapi version to 4.2.2 and check.
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I faced the same error and your solution helped me so thanks 
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