Ubuntu – How to clear recent history in Xubuntu 12.04

It seems like you're using quite recent version of zeitgeist engine, but an old version of zeitgeist-datahub, make sure you updated to the latest version of datahub available from zeitgeist PPA.

Update: Your installation is seriously screwed, apparently at one point you installed zeitgeist from source and you also have it installed from a package, another thing is that the latest version of datahub available in zeitgeist PPA is 0.5.1, version 0.5.2 was when it was still part of the engine package (ie from zeitgeist 0.5.2).

So first remove everything zeitgeist-related (all packages), then run locate zeitgeist and remove everything it finds (some of those will be already deleted). Next install zeitgeist package from PPA, but make sure you're also installing datahub from PPA (ie version 0.5.1), you might need to force using that version.