Oracle Message PCC-02368 - An EXEC TOOLS host variable context name is not type char

ERRORAn EXEC TOOLS host variable context name is not type char
CAUSEIf a host variable is used to define a context name in an EXEC TOOLS GET CONTEXT or EXEC TOOLS SET CONTEXT statement, that host variable must be of a character type.
ACTIONRedeclare the context name to a host variable of a char type.