Error when running dbms_stats

Hi,

I am running the following script and getting errors:
begin
dbms_stats.gather_schema_stats(ownname=> 'HS',estimate_percent=>
100,degree=> dbms_stats.auto_degree,granularity=> 'AUTO',method_opt=>
'FOR ALL COLUMNS SIZE AUTO',options=> 'GATHER',cascade=> TRUE); 
end;

ERROR at line 1:
ORA-00979: not a GROUP BY expression
ORA-06512: at "SYS.DBMS_STATS", line 13210
ORA-06512: at "SYS.DBMS_STATS", line 13556
ORA-06512: at "SYS.DBMS_STATS", line 13634
ORA-06512: at "SYS.DBMS_STATS", line 13593
ORA-06512: at line 2

This was working before, what can be the possible issue?

Thanks
--Harvinder

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