Message Oracle PCB-00603 - An EXEC TOOLS MESSAGE host variable is not a character type

ERRORAn EXEC TOOLS MESSAGE host variable is not a character type
CAUSEIf a host variable is used to specify the message in an EXEC TOOLS MESSAGE statement, that host variable must be of a character type.
ACTIONDeclare the message to a host variable of a char type. 625 - 649, EXEC SQL LOB statements