real question is. Why are you initializing a Global list inside a type declaration.
Type score Field list:tlist=CreateList() Method add_score(score:String) ListAddLast(list,score) End Method Method show() Print "Score Table" For Local i$ = EachIn list Print i Next End Method End Type foo:Score = New score foo.add_score("100") foo.add_score("200") foo.show()