TypeError: Object(…) is not a function in Angular project

Ionic Framework Ionic Angular
1

hello, i have a project which suddenly stop working. When i start it, i receive

TypeError: Object(...) is not a function
    at http://localhost:8100/build/vendor.js:168668:108
    at Object.<anonymous> (http://localhost:8100/build/vendor.js:168674:2)
    at __webpack_require__ (http://localhost:8100/build/vendor.js:55:30)
    at Object.368 (http://localhost:8100/build/main.js:868:69)
    at __webpack_require__ (http://localhost:8100/build/vendor.js:55:30)
    at Object.363 (http://localhost:8100/build/main.js:842:70)
    at __webpack_require__ (http://localhost:8100/build/vendor.js:55:30)
    at webpackJsonpCallback (http://localhost:8100/build/vendor.js:26:23)
    at http://localhost:8100/build/main.js:1:1

error
error1882×587 77.4 KB

Here is the repo url https://github.com/bozhidarmarinov/royal-estate