ORA-03001: unimplemented feature

 HI Experts. 

Please suggest for below error. Oracle version is 11.2.0.2.0 on HP 64BIT machine. 

SQL> SELECT /*+ PARALLEL (a 8) PARALLEL (b 8) */

SUM (space_used_delta) / 1024 / 1024 "USED_MB",

  2    3  SUM (c.bytes) / 1024 / 1024 "TOTAL_MB",

  4  ROUND (SUM (space_used_delta) / SUM (c.bytes) * 100, 2) || '%'"PERCENT"

  5  FROM dba_hist_snapshot sn,dba_hist_seg_stat a,

  6  dba_objects b,

  7  dba_segments c

  8  WHERE     end_interval_time > TRUNC (SYSDATE) - 7

  9  AND sn.snap_id = a.snap_id

 10  AND b.object_id = a.obj#

 11  AND b.owner = c.owner

AND b.object_name = c.segment_name

 12   13  AND c.owner = 'COMAPPO'

 14  AND space_used_delta > 0;

FROM dba_hist_snapshot sn,dba_hist_seg_stat a,