re: error on adding single assembly

Trying to load some of the framework 3.5 assemblies, I tried to load "system.core" but got the error:

You cannot call a method on a null-valued expression.

At TabExpansionLib.ps1:147 char:83

+     $nl |% {[void]$global:dsTabExpansion.tables['Types'].rows.add("Dummy",$_.split( <<<< '.').count ,$_)}

Any idea?

Thanks