11.5.10.2 : Error Applyng Patch patch 4138554

hi,
When I try to apply the patch 4138554, I have the following errors :

ATTENTION: All workers either have failed or are waiting:

          FAILED: file b5402149a.sql on worker  4.
          FAILED: file b5081398a.sql on worker  5.

File name :  adwork004.log
-----------------------------------------
sql /$APPL_TOP/ar/11.5.0/patch/115/sql/b5402149a.sql


Start time for statement below is: Fri Nov 22 2013 09:56:27

ALTER TABLE ar_payment_schedules_all ADD ( last_unaccrue_chrg_date date )

AD Worker error:
The following ORACLE error:

ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired


occurred while executing the SQL statement:

ALTER TABLE ar_payment_schedules_all ADD ( last_unaccrue_chrg_date date )