SQL & PL/SQL

Hi Gurus

I am working on Oracle 12.2.0.1.0.

I have created a table and trying to insert data into table. But was not able to load it. Can you please help me to insert data without any issues.

CREATE TABLE USER_TYPE 
   ( ID_TYPE VARCHAR2(13 BYTE) NOT NULL , 
DESCRIPTION VARCHAR2(255 BYTE), 
REC_STS_CODE CHAR(1 BYTE) NOT NULL , 
INSERT_USER VARCHAR2(20 BYTE) NOT NULL , 
INSERT_PROCESS VARCHAR2(80 BYTE) NOT NULL , 
INSERT_TIMESTAMP TIMESTAMP (6) NOT NULL , 
UPDATE_USER VARCHAR2(20 BYTE), 
UPDATE_PROCESS VARCHAR2(80 BYTE), 
UPDATE_TIMESTAMP TIMESTAMP (6), 
UPS_SRC_NUMBER NUMBER, 
O_INSERT_TIMESTAMP TIMESTAMP (6), 
O_UPDATE_TIMESTAMP TIMESTAMP (6)
   );

 INSERT INTO USER_TYPE VALUES('100','ORACLE PRODUCT','A','K12345','MANUAL',sysdate,'<null>','<null>','<null>','','','');

ORA-01858: a non-numeric character was found where a numeric was expected
   
   if I put  to_char(sysdate) instead of SYSDATE then also getting the error ORA-01843: not a valid month.
   

   Can you please help me to correct the syntax and load the data.

Thanks

Amy.