[xwiki-users] Fresh XWiki, getting "HTTP Status 500 - com.xpn.xwiki.XWikiException: Error number 11007 in 0: Failed to extract Entity Resource Reference from URL"

Hi, that's what I get, when browsing to our freshly installed XWiki instance "HTTP Status 500 - com.xpn.xwiki.XWikiException: Error number 11007 in 0: Failed to extract Entity Resource Reference from URL" The error appears, after the "XWiki Loading..." status has reached ca 50%. The complete stacktrace can be found at http://pastebin.com/SnuA0AY8. I've found quite some references to the error "Error number 11007", but most of them referred to the PostgreSQL JDBC driver not being installed. This is not the case on our system. One reference (http://jira.xwiki.org/browse/XWIKI-11477) seems to exactly match our error, but unfortunately none of the explanations given in this ticket are understandable for me. Our system is running on OpenSuSE 13.1 with PostgreSQL 9.2.14 (from repo), Apache Tomcat 8.0.30 (manually installed) and XWiki Enterprise 7.4 (WEB, manually installed). Any pointer to fix this problem is appreciated. Additional information can be provided if it is required. Cheers Frank