This is usually a sign that the Web folder is not right in some way.
Try running the "CopyAll.Bat" file and the "GzipAll.Bat" file from your app folder.
Check to see if the "copy" statement in CopyAll looks correct (ie folder names are correct etc) and perhaps run it manually to see if it's working ok.
It's copying from \clarion8\accessory\libsrc\netweb
so check there to see if that folder got updated by the install ok.
If all else fails, delete the netweb folder in \clarion8\accessory\libsrc, also delete the web folder for your app, and re-install 7.16
(make a backup of any custom css files etc before deleting the web folder <g>)
cheers
Bruce