R12.1.3 : AutoPatch error: Failed to generate the product JAR files

Hello,

R12.1.3 : AutoPatch error: Failed to generate the product JAR files

Log file is showing :

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

You are about to apply a patch to the installation of Oracle Applications
in your ORACLE database '...ROD'
using ORACLE executables in "....prod/apps/tech_st/10.1.3'.


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

AutoPatch error:
Error copying the Forms Registry file to /.....prod/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
--------------------

Thank you.