Am trying to authenticate my Oracle APEX app with LDAP using custom Authentication Scheme.

Here is my function and get error ORA-06550 apex_authenticate_ldap must be type. Appreciate any advice.

create or replace FUNCTION apex_authenticate_ldap (
    p_username IN VARCHAR2,
    p_password IN VARCHAR2
) RETURN BOOLEAN  
IS  
    l_ldap_host  VARCHAR2(100) := 'corp.mydomain';  
    l_ldap_port  NUMBER := 389;   
    l_base_dn    VARCHAR2(200) := 'OU=Vendors,OU=Service and Support,DC=corp,DC=mydomain,DC=com';  
    l_ldap_conn  DBMS_LDAP.session;
    l_result     PLS_INTEGER;
BEGIN  
    -- Initialize LDAP session  
    l_ldap_conn := DBMS_LDAP.init(l_ldap_host, l_ldap_port);  

    -- Attempt to bind (authenticate) user  
    l_result := DBMS_LDAP.simple_bind_s(
        l_ldap_conn, 
        'CN=' || p_username || ',' || l_base_dn, 
        p_password
    );  

    -- Close LDAP session  
    --DBMS_LDAP.unbind_s(l_ldap_conn);  

    -- If authentication is successful, return TRUE  
    RETURN TRUE;  

EXCEPTION  
    WHEN OTHERS THEN  
        -- Ensure LDAP session is closed in case of errors  
        RETURN FALSE;  -- Return FALSE if authentication fails  
END apex_authenticate_ldap;
/```


I have very limited experience with Oracle APEX.


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