This error occurs when attempting to use a collating sequence that is not supported by the current code page. The collating sequence assigned with SET COLLATE command or the COLLATE clause in the CREATE TABLE - SQL, ALTER TABLE - SQL, or INDEX commands must be a valid Visual FoxPro collating sequence.
You must specify a compatible code page in your Visual FoxPro configuration file. For example, you might see the error, "Collating sequence "CZECH" is not found" when you issue the command:
SET COLLATE TO "CZECH"
To enable support for the CZECH collating sequence, add the following line of code to your Config.fpw file and restart Visual FoxPro:
CODEPAGE = 1250