Created attachment 39085 [details]
The installation of the extension Presentation Minimizer fails after two errors (screenshots attached). The extension is there but not enabled, and when you try to enable it it fails again with the same two errors.
Created attachment 39086 [details]
seems to be this one http://de.openoffice.org/issues/show_bug.cgi?id=114049
So, Platform independ
Resolving as NOTOURBUG - the problem is inside the OOo extensions repo. That said, filed bug 30520 instead - we should provide working extensions ourselves.
That same extension installs without problems with OOo and NeoOffice, though.