Matthew,
as this works on my installation, there must be something
site specific going on. what version of tcl are you using?
A common source of problems is that during the last 10 or so versions, some source files of xowiki became obsolete. Unfortunately, the old files can harm the installation, doing just an update from cvs does not necessarily remove the obsolete files. I would recommend to move your existing xowiki + xotcl-core directories (in packages) to a different name and check out again.
Concerning error 1: did the update script work without problems? There is an update script for xowiki 0.30, which get rid of orphan content revisions (there are created, when e.g. in a content item new a title is provided; newer xowiki versions don't do this. you should be able to get rid of the problem by running the upgrade manually (see xowiki/tcl/xowiki-callback-procs.tcl).
concerning error 2: this is from a code added by malte to delete the object types when doing an uninstall. looks like the content::type::delete function in your installation does not support this flag. Which openacs version are you using?
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