[PixelFx]

this error has been addressed before it's easy to fix ..

got your admin cp, go to "User Profile Fields"

look for
Points No Yes No 250 25 [edit] [remove]

run mouse over edit, make a note of what field number it says, default is field 5 normally.

goto your Itemshop section, Edit Options,

read where it says, Point Field

change the field info to the id that you saw when you hovered your mouse over the "Points No Yes No 250 25 [edit] [remove]" edit button.

you might have it like field6 or something so you would just change it to that, and your error will be fixed

hope that helps