assumed (speculated?) that if $TWiki::Plugins::VERSION is greater than or equal to 2.1, TWiki::Func::getRequestObject() is provided. Now the latest version's $TWiki::Plugins::VERSION is 6.00, but TWiki::Func::getRequestObject() is not there.
The last change history item states "Made it compatible with TWiki Release 6.0.0" but this is still a problem for me in TWiki 6.0.0.
Sorry for a very late reply, but can you please elaborate your symptom?
Benjamin: The plugin was fixed in the repository last year, but the package was outdated. This is now fixed. Please install again.