If you have recently updated to a "New" version of TecDoc, the database alias might be pointing to an obsolete version.

To help you resolve this more quickly, could you share a bit more detail:

If you've followed these steps and the error persists, it may be necessary to perform a "Repair Installation" via the Windows Control Panel to restore missing registry keys.

The data was moved to a new drive (e.g., from C: to D:), but the configuration file still points to the old path. Step-by-Step Troubleshooting Guide 1. Verify SQL Server Services