Sometimes during the upgrade process, not all required columns or table may have been added to the database. This error may manifest itself with an “Error: Save failed” message when trying to save changes to a device.
A possible fix to this is to manually call the upgrade.php script. To do this, go to the command line and change to the thold plugin. Then call the upgrade script:
cd /path/to/cacti/plugins/thold php extras/upgrade.php
Then re-try saving a device. You will see the following messages:
Faking Low Thold Version Running Thold Upgrade Upgrade Complete