If you have tried all five solutions and the error persists, the problem may be deeper:
Prepare the following for support:
Look for entries defining:
Example of a correct local config:
[DATABASE]
Type=LOCAL
Path=C:\TECDOC\Data\
Version=7.2
[SYSTEM]
LogLevel=ERROR
Example of a corrupted config:
[DATABASE]
Path= (empty!)
Type=(gibberish symbols)
TECDOC often needs write access to its own install folder. Right-click the TECDOC shortcut → Run as administrator. If it works, you have a permissions issue (see Part 4). If you have tried all five solutions and