Rejection of suit on the ground of deposition of inadequate court fees

Plaintiff prayer:seeking declaration that the sale deed is invalid or non est or illegal or that it is not binding on her, since she did not execute any sale deeds and she has title to the property. Def. resistant & filed IA “To reject Original Suit on the ground of payment of inadequate court fee under section 40 of Tamil Nadu Court Fees and Suit Valuation Act, 1955 i.e., as per market values [She paid under section 25(d)]” Def Filed CRP in high court, SLP in supreme court got dismissed, file civil appeal allowed.Below are same paragraph sentence of civil appeal in Supreme Court:- "In the ultimate analysis, we arrive at the conclusion that the appeal is to be allowed, the impugned orders passed by the trial court and the High Court, being unsustainable are to be set aside and we so direct. The trial court is directed to grant three months time to the plaintiff to pay the requisite court fee."Q1-plaintiff need to pay court fee under section 40 or under 25(d)?Requisite court fee means?