This error usually occurs when connecting to a database or using an ODBC connector that is not supported by Toad for Data Analysts.
RESOLUTION:
Always refer to the System Requirements section of the Release Notes for a list of databases and ODBC connectors that are supported with the version of Toad for Data Analysts that you are using.
The Release Notes are available on the SupportLink website or by going to menu Help | Release Notes in Toad for Data Analysts.