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(node:21786) UnhandledPromiseRejectionWarning: ParallelSaveError: Can't save() the same doc multiple times in parallel. Document: 5b72536ea94963551a772498
    at ParallelSaveError.MongooseError [as constructor] (/var/www/html/coursewatch-backend/node_modules/mongoose/lib/error/mongooseError.js:11:11) 
    at new ParallelSaveError (/var/www/html/coursewatch-backend/node_modules/mongoose/lib/error/parallelSave.js:18:17)
    at model.Model.save (/var/www/html/coursewatch-backend/node_modules/mongoose/lib/model.js:345:23)
    at /var/www/html/coursewatch-backend/src/services/ellucian/index.js:64:10
    at tryCatcher (/var/www/html/coursewatch-backend/node_modules/bluebird/js/release/util.js:16:23)
    at Promise._settlePromiseFromHandler (/var/www/html/coursewatch-backend/node_modules/bluebird/js/release/promise.js:512:31)
    at Promise._settlePromise (/var/www/html/coursewatch-backend/node_modules/bluebird/js/release/promise.js:569:18)
    at Promise._settlePromise0 (/var/www/html/coursewatch-backend/node_modules/bluebird/js/release/promise.js:614:10)
    at Promise._settlePromises (/var/www/html/coursewatch-backend/node_modules/bluebird/js/release/promise.js:693:18)
    at Async._drainQueue (/var/www/html/coursewatch-backend/node_modules/bluebird/js/release/async.js:133:16)
    at Async._drainQueues (/var/www/html/coursewatch-backend/node_modules/bluebird/js/release/async.js:143:10)
    at Immediate.Async.drainQueues (/var/www/html/coursewatch-backend/node_modules/bluebird/js/release/async.js:17:14)
    at runCallback (timers.js:810:20)
    at tryOnImmediate (timers.js:768:5)
    at processImmediate [as _immediateCallback] (timers.js:745:5)
(node:21786) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:21786) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.