Right-click the TecDoc shortcut or .exe and select "Run as Administrator" to ensure it has permission to read the config files.

The application cannot locate or access the database engine (often SQL Server or Transact-SQL) specified in the configuration. Incorrect Path Mapping:

"Deleted a hidden file called tecdoc.lock in the data folder. That file remains when the app crashes previously. Deleting it fixed the loading failure."

: Right-click the executable and select Run as Administrator to ensure it has the permissions to read the configuration file.