I don't get any other errors. Using Trabis' code removes the error message, but I still just get a plain text input area with no controls.
Upgrading from XOOPS 2.0.16
1. Get the update package from the sourceforge file repository
2. Overwrite your existing files with the new ones
Upgrading from XOOPS 2.0.14/2.0.15 (easy way)
1. Get the appropriate update package from the sourceforge file repository
2. Overwrite your existing files with the new ones
3. Access <your.site.url>/upgrade/ with a browser
4. Follow the instructions to update your database
5. Delete the upgrade folder
Upgrading from XOOPS 2.0.14/2.0.15 (using the full package)
1. Move the "upgrade" folder inside the "htdocs" folder (it's been kept out as it's not needed for full installs)
2. Delete htdocs/mainfile.php, and htdocs/install
3. Upload the content of the htdocs folder over your existing files
4. Access <your.site.url>/upgrade/ with a browser
5. Follow the instructions to update your database
6. Delete the upgrade folder