Getting hard rejected and need advice

This is my first time uploading item to Codecanyon
Within 6 hours of reviewing, i received an email containing rejection about my item

Here is the content of the email:
Thank you for your submission. We have completed our review of “ClickWithDoc - Clinic Management Sytem” and 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.

We appreciate the effort and time you’ve put into creating your item. And we’d be happy to help make sure your next entry will meet our submission requirements. Here’s our advice:

Visit our forums and ask fellow authors for feedback. Our helpful community will be glad to lend a hand.

Check out this Help Center article to understand why and how items get rejected.

Remember you can get help in the form of tutorials on Envato Tuts+.

We hope to see a new submission from you soon!

All the best!

Envato Quality team

Now I really need advice about my item
Here is the demo link:
Login using email: and password: 123123123

and here is the link of documentation:

Please help me guys :blush: for developing better item someday