-191 A STRING CANNOT BE USED BECAUSE IT IS INVALID MIXED DATA

Explanation
 The operation required the conversion of a mixed
data character string to a different coded character set. The string
could not be converted because it does not conform to the rules for
well-formed mixed data.

System action
 The statement cannot be processed.

Programmer response
 If the string contains the intended information,
the description of the column or host variable should be changed from
MIXED DATA to BIT or SBCS DATA. If the description of the column or
host variable is correct, the string is the problem and it must be
changed to conform to the rules for well-formed mixed data.

SQLSTATE
 22504