the SCF plugin store is providing a plugin that is compatible with SU 8 but not Su pro 2013. I am getting error like >>

"Error Loading File SectionPropCalculator.rb
undefined method `GetString' for nil:NilClass"

can someone help me out, this one is an important plugin for me, I need it at any cost. it was working big time with SU 8 , but after I installed Su 2013 , I tried installing the same via SCF plugin to install it but