Assets/Standard Assets/Effects/ImageEffects/Scripts/Antialiasing.cs(20,45): error CS1525: Unexpected symbol `)', expecting `(', `,', `{', or `where'

what do i do for this
Assets/Standard Assets/Effects/ImageEffects/Scripts/Antialiasing.cs(20,45): error CS1525: Unexpected symbol )', expecting (‘, ,', {’, or `where’
here is the screenshot of my script

Remove the [ to the left of “public”, and the ) just after “PostEffectsBase”, both on line 20.