#39 "Fatal Error" after install ....

[Anonymous]

After finish all the itens on the INSTALL.txt, when i try
to access from the browser, receives the following
message:

urlBack = "$PHP_SELF?$QUERY_STRING"; /* page
reloader so that alarms and news pagelets stay up to
date */ header( "Refresh: 400" ); PageHead(); ?>
Fatal error: Call to a member function on a non-object
in /var/www/html/webo/lib/webo/Desktop.php on line 94

Thanks any help