ORA-00054: resource busy and acquire with NOWAIT specified

SQL>  create index abc on xys (object_id) tablespace mytbs;

 create index abc on xys (object_id) tablespace mytbs

                     *

ERROR at line 1:

ORA-00054: resource busy and acquire with NOWAIT specified

SELECT a.SID, a.serial#

  2  FROM v$session a, v$locked_object b, DBA_OBJECTS c

  3  WHERE b.object_id = c.object_id

  4  AND a.SID = b.session_id AND OBJECT_NAME='XYS';

       SID    SERIAL#

---------- ----------

       158      25604

• Commit or rollback the statement  causing issue
• Wait  till  release resources
• Kill that session using

alter system kill session 'sid,serial#'