problems with upgrading from 3.0 to 3.1

[pigsound]

Warning: mkdir() [function.mkdir]: Keine Berechtigung in /cluster/www/myhomepage.xy/GetSimple_3.0/admin/inc/common.php on line 76

Warning: SimpleXMLElement::asXML(/cluster/www/myhomepage.xy/GetSimple_3.0/data/other/plugins.xml) [simplexmlelement.asxml]: failed to open stream: Keine Berechtigung in /cluster/www/myhomepage.xy/GetSimple_3.0/admin/inc/basic.php on line 273

i wonder why there has been created a directory "clusterwwwmyhomepage.xyGetSimple_3.0datanews" within the "admin"-directory.