How to fix 'identifier 'ACCOUNT_REQUEST_TBL' must be declared - oracle

Question

an error
FRM-40735: WHEN-BUTTON-PRESSED trigger raised unhandled
exception ORA-06502
raises when I try to insert my fields as below. What could be the reason ?
DECLARE
v_reqid NUMBER(10) := :txtreqid;
v_branch VARCHAR2(15) := :txtbranch;
v_acctype VARCHAR2(15) := :txtacctype;
v_title VARCHAR2(4) := :txttitle;
v_firstname VARCHAR2(15) := :register.txtfirstname;
v_lastname VARCHAR2(15) := :register.TXLASTNAME;
v_DOB DATE := :txtdob;
v_workp NUMBER(10) := :txtworkp;
v_hphone NUMBER(10) := :txthphone;
v_address VARCHAR2(30) := :txtadd;
v_state_info VARCHAR2(15) := :txtstate;
v_hphone NUMBER(10) := :txtzip;
v_email VARCHAR2(30) := :txtemail;
v_status VARCHAR2(10) := :txtstatus;
v_user_name VARCHAR2(30) := :txtun;
v_password VARCHAR2(30) := :txtpw;
BEGIN
INSERT INTO account_request_tbl
VALUES(v_reqid,v_branch,v_acctype,v_title,v_firstname, v_lastname,v_DOB,v_workp,
v_hphone,v_address,v_state_info,v_hphone,v_email,v_status,v_user_name,v_password);
COMMIT;
message('You have succesfully created a new account!');
END;

Answer 1

Assuming the variable name are derived from the table account_request_tbl columns' names, define your variables' data types by using account_request_tbl.<column_name>%type instead. Since your issue is related with the mismatch of data types and/or precision between local variables and data types of columns :
DECLARE
v_reqid account_request_tbl.reqid%type := :txtreqid;
v_branch account_request_tbl.branch%type := :txtbranch;
v_acctype account_request_tbl.acctype%type := :txtacctype;
v_title account_request_tbl.title%type := :txttitle;
v_firstname account_request_tbl.firstname%type := :register.txtfirstname;
v_lastname account_request_tbl.lastname%type := :register.TXLASTNAME;
v_DOB account_request_tbl.dob%type := :txtdob;
v_workp account_request_tbl.workp%type := :txtworkp;
v_hphone account_request_tbl.hphone%type := :txthphone;
v_address account_request_tbl.address%type := :txtadd;
v_state_info account_request_tbl.state_info%type := :txtstate;
v_email account_request_tbl.email%type := :txtemail;
v_status account_request_tbl.status%type := :txtstatus;
v_user_name account_request_tbl.user_name%type := :txtun;
v_password account_request_tbl.password%type := :txtpw;
BEGIN
INSERT INTO account_request_tbl(reqid,branch,acctype,title,firstname,lastname,dob,workp,
hphone, address, state_info, email, status, user_name, password )
VALUES(v_reqid,v_branch,v_acctype,v_title,v_firstname, v_lastname,v_DOB,v_workp,
v_hphone,v_address,v_state_info,v_email,v_status,v_user_name,
v_password);
IF SQL%ROWCOUNT > 0 THEN
COMMIT;
message('You have succesfully created a new account!');
ELSE
ROLLBACK;
message('Unfortunately, you couldn''t create a new account !!!');
END IF;
END;
The reson for the error might vary such as the field :txtadd's length doesn't fit for VARCHAR2(30), or the value in :txtreqid field is of string type .. etc.
Indeed no need to declare variables explicitly, direct substitution within the INSERT statement is enough( thanks #AndyDan ) as
INSERT INTO account_request_tbl(reqid,branch,acctype,title,firstname,lastname,dob,workp,
hphone, address, state_info, email, status, user_name, password )
VALUES(:txtreqid,:txtbranch,:txtacctype,:txttitle,:register.txtfirstname,
:register.txlastname, :txtdob, :txtworkp,:txthphone, :txtadd, :txtstate,:txtemail,
:txtstatus, :txtun, :txtpw);