0401 테이블 모델링

 CREATE TABLE TBL_COURSE(

    ID VARCHAR2(10) NOT NULL PRIMARY KEY

    ,CATEGORY VARCHAR2(10) NOT NULL

    ,CATEGORY2 VARCHAR2(10) NOT NULL

    ,NAME VARCHAR2(50) NOT NULL

    ,MENTO VARCHAR2(10) NOT NULL

    ,PRICE NUMBER(10) NOT NULL

    ,LEVEL NUMBER(2) DEFAULT 1

    ,DISCOUNT NUMBER(3) DEFAULT 0

    ,CONTENT VARCHAR2(1000) 

    ,IMG VARCHAR2(1000) 

    ,REGDATE DATE DEFAULT SYSDATE

    ,CONSTRAINT FK_COURSE_CATEGORY FOREIGN KEY(CATEGORY) 

     REFERENCES TBL_CATEGORY(ID)

     ,CONSTRAINT FK_COURSE_CATEGORY2 FOREIGN KEY(CATEGORY2) 

     REFERENCES TBL_CATEGORY(ID)

     ,CONSTRAINT FK_COURSE_MEMBER FOREIGN KEY(MENTO)

     REFERENCES TBL_MEMBER(ID)

     ,CONSTRAINT C_LEVEL CHECK (LEVEL BETWEEN 1 AND 3)

     );

왜 계속 오류가 나는가..... 어디서 틀렸지... !!!ㅜ-ㅜ