SQL query giving error msg not enough values

-- table script
CREATE TABLE employees
( 
    EMPLOYEE_ID NUMBER(6) NOT NULL, 
    FIRST_NAME  VARCHAR2(20),
    LAST_NAME VARCHAR2(25) NOT NULL,
    SALARY NUMBER(8,2),
    HIREDATE DATE,
    DEPARTMENT_ID NUMBER(4)
);

CREATE SEQUENCE emp_seq  --Sequence creation
     START WITH 1
     INCREMENT BY 1
     NOCACHE;

Question: when I tried to run this insert query, I get an error "not enough values":

INSERT INTO employees (employee_id, last_name, hiredate)
VALUES ((SELECT emp_seq.nextval, 'Smith', SYSDATE FROM dual));

Can someone explain why?

I tried running nested select statement individually, getting desired result, but when tried both queries together I’m getting that error.

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