SQL & PL/SQL

I have this Oracle table:

CREATE TABLE USERGROUPS(
  GROUPID INTEGER NOT NULL,
  GROUPNAME VARCHAR2(40 ),
  GROUPSTATUS VARCHAR2(30 ),
  DATEGROUPADDED DATE,
  DATEGROUPLOCKED DATE,
  GROUPEXPIREDATE DATE,
  DESCRIPTION CLOB
)
/

I tried to run this SQL query:

SELECT c.*
FROM
  (SELECT b.*,
    rownum rn
  FROM
    (SELECT a.* FROM USERGROUPS a ORDER BY GROUPID ASC
    ) b
  WHERE rownum <= 5
  ) c
WHERE rn > 10

I get this error message in SQL developer when I run it:

ORA-00904: "GROUPID": invalid identifier
00904. 00000 - "%s: invalid identifier"
*Cause:
*Action:
Error at Line: 5 Column: 25

I also tested this SQL query:

SELECT GROUPID FROM USERGROUPS 

I get this error:

ORA-00904: "GROUPID": invalid identifier
00904. 00000 - "%s: invalid identifier"
*Cause:
*Action:
Error at Line: 1 Column: 7

Can you help me to fix the problem?