#128 download link from 'view project file' fails

[petrelharp]

... and produces a white screen, due to this error:

[Mon Sep 12 16:23:49 2011] [error] [client XXX] PHP Fatal error: Call to undefined function wfGetType() in [...]/extensions/WorkingWiki/misc.php on line 337, referer: [...]?title=Special:GetProjectFile&project=DebugPage&make=false&filename=preamble.tex