Thread:Talk:Semantic Maps/SemanticMaps 3.0c error

Wanted to give SMW 1.9 a whirl, but got hung up on this error:

Fatal error: Call to a member function setInputTypeHook on a non-object in C:\inetpub\wikiocity.com\dev\extensions\SemanticMaps\includes\forminputs\SM_FormInputs.php on line 101

I have all of the extension dependencies, but I'm still on Mediawiki 1.20. Is 1.21 absolutely necessary, or is something else causing the error?

Thanks!