Why my item has been rejected on first submission?

Need suggestion from seniors , please help me to improve it and get approval on next submission.

Envato Quality team said unfortunately we found it isn’t at the quality standard required to move forward, and you won’t be able to re-submit this item again. But they didn’t said which pert it isn’t at the quality standard, now how can i find issues and solve them for re-submit?

Item Name: SkyWebTech - Advanced Multipurpose PHPApplication with Social Login & User Management System

Demo Front-end: https://skywebdevelopment.com/apps/skywebtech
Demo Back-end: https://skywebdevelopment.com/apps/skywebtech/admin
Documentation: https://skywebdevelopment.com/apps/skywebtech/documentation/index.html

Thanks in advance.

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