Oracle Message PCC-00003 - Invalid SQL Identifier at column number in line number of file string

ERRORInvalid SQL Identifier at column number in line number of file string
CAUSEThe symbol in a conditional precompilation statement (such as EXEC ORACLE IFDEF) is invalid, or the name of a SQL descriptor, statement, or cursor is invalid or was not properly declared.
ACTIONCheck the statement syntax and spelling of the identifier and check that a reserved word was not accidentally used. If necessary, define the identifier in a variable declaration or DECLARE statement ahead of the line in error.