RC7 Dateimanager häufiger Fehler 500 Fehler

[Mysterious]

Das /var/log/apache/users/hostingdomin.de-access.log gibt nur den Aufruf der Fehlermeldungen aus also

Code:

91.89.113.22 - - [12/Feb/2009:09:44:30 +0100] "POST /tools/filemanager/index.php HTTP/1.1" 500 1148 "http://admin.hostingdomain.de/tools/filemanager/" "Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.0.6) Gecko/2009011913 Firefox/3.0.6"
91.89.113.22 - - [12/Feb/2009:09:44:50 +0100] "GET /errors/inc/errordocs.js HTTP/1.1" 304 - "http://admin.hostingdomain.de/tools/filemanager/index.php" "Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.0.6) Gecko/2009011913 Firefox/3.0.6"
91.89.113.22 - - [12/Feb/2009:09:44:50 +0100] "GET /errors/inc/errordocs.css HTTP/1.1" 304 - "http://admin.hostingdomain.de/tools/filemanager/index.php" "Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.0.6) Gecko/2009011913 Firefox/3.0.6"
91.89.113.22 - - [12/Feb/2009:09:44:50 +0100] "GET /errors/inc/error_top.jpg HTTP/1.1" 304 - "http://admin.hostingdomain.de/errors/inc/errordocs.css" "Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.0.6) Gecko/2009011913 Firefox/3.0.6"
91.89.113.22 - - [12/Feb/2009:09:44:50 +0100] "GET /errors/inc/valid_css.jpg HTTP/1.1" 304 - "http://admin.hostingdomain.de/tools/filemanager/index.php" "Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.0.6) Gecko/2009011913 Firefox/3.0.6"
91.89.113.22 - - [12/Feb/2009:09:44:50 +0100] "GET /errors/inc/valid_xhtml.jpg HTTP/1.1" 304 - "http://admin.hostingdomain.de/tools/filemanager/index.php" "Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.0.6) Gecko/2009011913 Firefox/3.0.6"

GIbt es noch andere relevante LOGs oder Debugging Schalter wo man was genaueres finden könnte?