SQL Statement error

I have the following sql server script and want to create a view with it.

WITH ROLLUP(ID,PARENT_ACCT_ID,[Level],Description, Active_flag, Type, Currency_ID) AS (SELECT ID, PARENT_ACCT_ID, 0 as Level, Description, Active_Flag, Type, Currency_ID
         FROM   ACCOUNT where PARENT_ACCT_ID is null
         UNION ALL
         SELECT R1.ID, R1.PARENT_ACCT_ID, R2.Level + 1, R1.Description, R1.Active_Flag, R1.Type, R1.Currency_ID
                FROM   ACCOUNT R1
                JOIN ROLLUP R2
                ON R1.PARENT_ACCT_ID = R2.ID)
SELECT ID,
  CASE WHEN [Level] = 0 THEN ID ELSE '' END AS L0,
  CASE WHEN [Level] = 1 THEN ID ELSE '' END AS L1,
  CASE WHEN [Level] = 2 THEN ID ELSE '' END AS L2,
  CASE WHEN [Level] = 3 THEN ID ELSE '' END AS L3,
  CASE WHEN [Level] = 4 THEN ID ELSE '' END AS L4,
  CASE WHEN [Level] = 5 THEN ID ELSE '' END AS L5,
  CASE WHEN PARENT_ACCT_ID IS NOT NULL THEN PARENT_ACCT_ID ELSE '' END AS PARENT_ACCT,
  Description, Active_Flag, Type, Currency_ID
FROM  ROLLUP
GROUP BY [Level], ID, PARENT_ACCT_ID, Description, Active_Flag, Type, Currency_ID


The field called Level isn't a field in the database table.  When I try to execute the script, I get the following error:

Error in SELECT clause: expression new 'LEVEL'.
Missing FROM clause.
Unable to parse query text.

Can anyone tell me where to look for the error?