Why my code is rejected

I got below mail its showing its rejected due to quality, can you please let me know what type of quality, this is standard CMS script which is using by lots of developer can you please explain more or specify reason, because qulity rejection is not a reason i am sure about that

Thank you for your submission. We have completed our review of “Flix- Multipurpose Website & CMS” 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: