i think mniip is using some of the new features of the current tpt source code. so it will not work until you get the bleeding edge release from http://superdoxin.com/buildserv/
if youre not using linux, you only can wait for the 86 release.
EDIT: or compile it yourself :) https://powdertoy.co.uk/Wiki/W/Compiling_tpt%2B%2B_with_Visual_studio.html