As a matter of fact the glossary istnt compatible to vB4 yet but a version for vB4 will be released as soon as the membermap has been ported.
If you deleted vbglossar.php... how could it be used and caused such an error? I hardly doubt that the glossary was de-installed for good. Also the URL works but shows a crashed vB4, I dont see any disconnected site

I believe that the upgrade to 4.0 didnt work