[xwiki-users] Upgrade from 3.5.1. to 4.0 is failing

When I try to migrate the database from the version 3.5.1 to the version 4.0, i get the following error message: HTTP ERROR 500 Problem accessing /xwiki/bin/view/Main/. Reason: Error number 3 in 0: Could not initialize main XWiki context Wrapped Exception: Error number 3202 in 3: Exception while reading document [name = [XWikiPreferences], type = [DOCUMENT], parent = [name = [XWiki], type = [SPACE], parent = [name = [xwiki], type = [WIKI], parent = [null]]]] Wrapped Exception: Could not create a DBCP pool. There is an error in the hibernate configuration file, please review it. Caused by: com.xpn.xwiki.XWikiException: Error number 3 in 0: Could not initialize main XWiki context Wrapped Exception: Error number 3202 in 3: Exception while reading document [name = [XWikiPreferences], type = [DOCUMENT], parent = [name = [XWiki], type = [SPACE], parent = [name = [xwiki], type = [WIKI], parent = [null]]]] Wrapped Exception: Could not create a DBCP pool. There is an error in the hibernate configuration file, please review it. at com.xpn.xwiki.XWiki.getMainXWiki(XWiki.java:413) -- View this message in context: http://xwiki.475771.n2.nabble.com/Upgrade-from-3-5-1-to-4-0-is-failing-tp75… Sent from the XWiki- Users mailing list archive at Nabble.com.