I am cloned this app <https://github.com/sequelize/express-example> which appears to be the official sequelize express example but I get this error when I try to run it

`Unhandled rejection TypeError: Cannot read property '_pseudo' of undefined
 at conformInclude (/Users/wasswasam/express-example-master/node_modules/sequelize/lib/model.js:277:14)`

I am not sure what's going on.