How to write Eval Script for Master of the Shield Wall class ability (FGG)

[Ionik Knight]

Hello everyone,

I have been beating my head against the wall trying to get this class ability (Spear Maiden; Paladin Archetype; Frog God Games) to work in HL Classic Editor for three days. Would one of you kind souls take pity on me show me how to get this ability to work?

"Master of the Shieldwall (Ex): At 4th level, the spear maiden gains the
Shield Wall** feat whether or not she has the prerequisites for it. She can
use it even if her ally does not have this feat. When she uses this feat, she
gains a +1 bonus to her attack and damage rolls. This bonus increases by
+1 every 3 levels. This replaces spells."

Or, if anyone already has a Data File for The Northlands Saga (Frog God Games) that would be even better.

Thanks in Advance!