I updated the download packages i downgraded jquery to version 2.2.4
Based on youtube video, YAF is still using Jquery UI 2.2.4. Based on link below, that version was released in March 2015.
https://jqueryui.com/download/all/ I would recommend upgrading Jquery UI to latest version to make it compatible with Jquery 3.1. Jquery 3.1 is not a drop in replacement for Jquery 2.2. There are many breaking changes. Hence there are so many errors appearing in chrome browser tool.
Also bootstrap 4 alpha 6 requires jquery 3.1.1 per the link below:
https://v4-alpha.getboot...ng-started/introduction/ Hence if you downgrade to jquery 2.2.4, it is likely to create more errors in bootstrap.