When starting the WhatsUp Gold application, you may see a "Version Mismatch" error if the program version does not match the database version. The WhatsUp Gold application can only use a database that is compatible with the version of the software currently installed. For example, WhatsUp Gold v12 cannot use a database containing the WhatsUp Professional 2006 schema.
This problem most often occurs when the WhatsUp Gold application was upgraded and the database was in a non-default configuration, but the WhatsUp database schema was not upgraded. It may also occur if you restore a WhatsUp Gold database from an earlier version of the application.
To resolve this problem, upgrade the database schema to match the version of the currently installed application with the instructions in the Upgrading the database schema.
The WhatsUp Gold Polling Engine will not run, nor can the WhatsUp Gold application or web interface be used until this database version mismatch error is corrected.