How to delete a migration using sequalize-cli

In your case, you must add the deleted migration file back in because Sequelize requires it to roll back your migrations. If you don't have it, you can add a blank migration file titled 20171125081136-create-task.js. The file must have a down function that returns a successful promise.

'use strict';

module.exports = {
  up: function(queryInterface, Sequelize) {
    return Promise.resolve()
  },

  down: function(queryInterface) {
    return Promise.resolve()
  }
};

Going forward, if you want to delete a migration:

1. Undo the latest migration: node_modules/.bin/sequelize db:migrate:undo
2. Delete the latest migration file

I was getting the same issue an this is how I solved it:

Sequelize stores the migration history within a separate table, ex "SequelizeMeta". If you delete a migration file and no longer want to use it after, you can remove the migration rows corresponding to your migration file from the SequelizeMeta table.

Hope that helps!