Procedure calling gone bad - Statement Ignored - oracle

Question

I have the following procedure to insert users in a table:
CREATE OR REPLACE PROCEDURE ELR_ADD_USER
(I_NAME IN VARCHAR2,
I_MORADA IN VARCHAR2,
I_BIRTHDATE IN DATE,
I_COUNTRY IN VARCHAR2,
O_ID OUT NUMBER,
O_ERROR_MSG OUT VARCHAR2)
IS
ERROR_NULL EXCEPTION;
BEGIN
IF I_NAME IS NULL OR
I_MORADA IS NULL OR
I_BIRTHDATE IS NULL OR
I_COUNTRY IS NULL THEN
RAISE ERROR_NULL;
END IF;
O_ID := ELR_seq_USER_ID.nextval;
IF O_ID IS NULL
RAISE ERROR_NULL;
END IF;
INSERT INTO ELR_USERS
VALUES (O_ID, I_NOME, I_MORADA, I_BIRTHDATE, I_COUNTRY);
EXCEPTION
WHEN ERROR_NULL THEN
O_ERROR_MSG := 'NULL FIELDS';
WHEN OTHERS THEN
O_ERROR_MSG := 'UNEXPECTED ERROR: '|| sqlerrm;
END;
/
I think the procedure and it's syntax are correct. However when I'm trying to call it with:
DECLARE
P_NAME VARCHAR2(50);
P_MORADA VARCHAR2(50);
P_BIRTHDATE DATE;
P_COUNTRY VARCHAR2(20);
P_ID NUMBER(20);
P_ERROR_MSG VARCHAR2(4000);
BEGIN
ELR_ADD_USER('ED WARNER','CENAS Street',SYSDATE,
'China', P_ID, P_ERROR_MSG);
IF P_ERROR_MSG IS NOT NULL THEN
DBMS_OUTPUT.PUT_LINE('ERROR: '||P_ERROR_MSG);
END IF;
END;
/
I get the following message:
Is there something wrong with the calling or the procedure itself?

Answer 1

ORA-06550 followed by PLS-00905 is clearly a compilation error. The procedure is in INVALID state.
Recompile the procedure, and use SHOW ERRORS to get the complete error details.
SHOW ERROR PROCEDURE RMS_MM.ELR_ADD_USER or simply SHOW ERRORS
For example,
SQL> CREATE OR REPLACE PROCEDURE TestProc
2 AS
3 vnum number;
4 BEGIN
5 vnum := vAnotherNum;
6 END;
7 /
Warning: Procedure created with compilation errors.
SQL> execute TestProc();
BEGIN TestProc(); END;
*
ERROR at line 1:
ORA-06550: line 1, column 7:
PLS-00905: object EXAMPLE.TESTPROC is invalid
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored
SQL> show error procedure TestProc;
Errors for PROCEDURE TESTPROC:
LINE/COL ERROR
-------- -----------------------------------------------------------------
5/1 PL/SQL: Statement ignored
5/9 PLS-00201: identifier 'VANOTHERNUM' must be declared