ACS Result - - Not Assessable Due to Insufficient Documentation

I got my ACS Skill assessment result on 30th July.
I shared colored scan/ original soft copy of documents:

  1. Offer Letter
  2. Hike Letter (if any)
  3. Form 16
  4. salary slips - 3 months
  5. Relieving letter
  6. Affidavit / Experience letter from employer on company letterhead

Not really sure why my application was rejected, what else does ACS require?

Salary slip for each year that you have worked is required.

One for start of year and second for end of year.