Ditto glossary help

I have recently read the thread provided about Ditto glossaries (An a to z system using glossary extender). But I am stuck on the following:


I have now created a new snippet, added the Glossary extender php. I called this snippet Dittoglos.

My call is : [[Dittoglos? &parents=`71` &depth=`2` &display=`all` &extenders=`glossaryFilter` &filterVar=`alias` &filterBy=`^0-9`]]

I get a parser Syntax error, an unexpected string?
Can anyone please help