addPost

{ SequelizeValidationError: notNull Violation: Post.userId cannot be null
    at Promise.all.then (/Users/nickchang/work/thinkful/tc/donovanky/bloccit/node_modules/sequelize/lib/instance-validator.js:74:15)
    at tryCatcher (/Users/nickchang/work/thinkful/tc/donovanky/bloccit/node_modules/bluebird/js/release/util.js:16:23)
    at Promise._settlePromiseFromHandler (/Users/nickchang/work/thinkful/tc/donovanky/bloccit/node_modules/bluebird/js/release/promise.js:517:31)
    at Promise._settlePromise (/Users/nickchang/work/thinkful/tc/donovanky/bloccit/node_modules/bluebird/js/release/promise.js:574:18)
    at Promise._settlePromise0 (/Users/nickchang/work/thinkful/tc/donovanky/bloccit/node_modules/bluebird/js/release/promise.js:619:10)
    at Promise._settlePromises (/Users/nickchang/work/thinkful/tc/donovanky/bloccit/node_modules/bluebird/js/release/promise.js:699:18)
    at Promise._fulfill (/Users/nickchang/work/thinkful/tc/donovanky/bloccit/node_modules/bluebird/js/release/promise.js:643:18)
    at PromiseArray._resolve (/Users/nickchang/work/thinkful/tc/donovanky/bloccit/node_modules/bluebird/js/release/promise_array.js:126:19)
    at PromiseArray._promiseFulfilled (/Users/nickchang/work/thinkful/tc/donovanky/bloccit/node_modules/bluebird/js/release/promise_array.js:144:14)
    at Promise._settlePromise (/Users/nickchang/work/thinkful/tc/donovanky/bloccit/node_modules/bluebird/js/release/promise.js:579:26)
    at Promise._settlePromise0 (/Users/nickchang/work/thinkful/tc/donovanky/bloccit/node_modules/bluebird/js/release/promise.js:619:10)
    at Promise._settlePromises (/Users/nickchang/work/thinkful/tc/donovanky/bloccit/node_modules/bluebird/js/release/promise.js:699:18)
    at _drainQueueStep (/Users/nickchang/work/thinkful/tc/donovanky/bloccit/node_modules/bluebird/js/release/async.js:138:12)
    at _drainQueue (/Users/nickchang/work/thinkful/tc/donovanky/bloccit/node_modules/bluebird/js/release/async.js:131:9)
    at Async._drainQueues (/Users/nickchang/work/thinkful/tc/donovanky/bloccit/node_modules/bluebird/js/release/async.js:147:5)
    at Immediate.Async.drainQueues [as _onImmediate] (/Users/nickchang/work/thinkful/tc/donovanky/bloccit/node_modules/bluebird/js/release/async.js:17:14)
    at runCallback (timers.js:705:18)
    at tryOnImmediate (timers.js:676:5)
    at processImmediate (timers.js:658:5)
  name: 'SequelizeValidationError',
  errors:
   [ ValidationErrorItem {
       message: 'Post.userId cannot be null',
       type: 'notNull Violation',
       path: 'userId',
       value: null,
       origin: 'CORE',
       instance: [Post],
       validatorKey: 'is_null',
       validatorName: null,
       validatorArgs: [] } ] }