You want to be able to read a UNICODE character set from the database instance to an ASCII variable. However, at least one character is a UNICODE character which cannot be converted to ASCII.
This error can only occur if native SQL was entered in UNICODE columns in liveCache, or if UNICODE and ASCII applications are both using the same liveCache instance.
If you modified UNICODE columns in liveCache using native SQL, check whether these changes are ASCII-compliant.
If you did not make any changes using native SQL, contact Support.