R12.1.3 / Patch# 16870620:R12.AP.B failing

Hi,
The suggeted patch:16870620 by oracle has been failed , the said patch is showing the given message:

AutoPatch error:
Error copying the Forms Registry file to /..../apps/apps_st/comn/java/classes/oracle/forms/registry/Registry.dat.


adogjf() Unable to copy Registry.Dat.

AutoPatch error:
Failed to generate the product JAR files


From the log file :
---------------------------------------------------
Done Generating JAR files under JAVA_TOP: Thu Jul 04 2013 12:15:07



STRT_TASK: [Copy Registry.Dat to JAVA_TOP] [] [Thu Jul 04 2013 12:15:07]


 Copying Registry.dat from the Forms Java directory to /prod_appl_home/apps/apps_st/comn/java/classes ...

AutoPatch error:
Error copying the Forms Registry file to /..../apps_st/comn/java/classes/oracle/forms/registry/Registry.dat.