Why I have this error when I'll upgrade apex 4 to apex 5
PL/SQL procedure successfully completed.
-- Now beginning upgrade. This will take several minutes.-------
-- Ensuring template names are unique -------
-- Migrating metadata to new schema -------
begin
*
ERROR at line 1:
ORA-20000: Unable to gather statistics concurrently, insufficient privileges
ORA-06512: at "SYS.DBMS_STATS", line 25335
ORA-06512: at "SYS.DBMS_STATS", line 25414
ORA-06512: at "SYS.DBMS_STATS", line 25367
ORA-06512: at "APEX_050000.WWV_FLOW_UPGRADE", line 3775
ORA-06512: at line 4
-- Switching Builder to new schema -------
-- Migrating SQL Workshop metadata -------
-- Upgrading new schema. -------
-- Copying preferences to new schema. -------
-- Upgrading Websheet objects. -------
timing for: Recompiling APEX_050000 schema