ORA-01006: bind variable does not exist.

Hi everyone,

I am beginner at SQL.

trying to work out the sql formula and I got this error message. Not sure what is wrong or what I am missing.

https://preview.redd.it/otka3kphwhzc1.png?width=1227&format=png&auto=webp&s=9baf154357e2e0a730080e2866f0614b1aac7b5d

REP-1401: A fatal PL/SQL error occurred in program unit cf_cust_refformula.

ORA-01006: bind variable does not exist

ORA-06512: at "OPERA.OPERA_FUNC", line 618

ORA-06512: at "OPERA.GET_VALUE", line 46

https://preview.redd.it/kwd68h9xwhzc1.png?width=1134&format=png&auto=webp&s=74627703a7af0f987a952412fbb4d92aa0826635

function CF_1formula return Char is

begin

RETURN GET_VALUE('CUSTOM_REFERENCE','RESERVATION_GENERAL_VIEW','RESV_NAME_ID',:RESV_NAME_ID_HEADER);

end;

Thank you for your help!

If you can refer to some study materials, would be appreciated!