while applying patch adop phase=prepare,apply patches=20784036 adop exiting with status = 1 (Fail)

Hi

while applying patch getting error [UNEXPECTED]Error 1 occurred while Executing txkADOPValidation script on dev

please provide action plan for resolving this error.

[appluat@dev scripts]$ adop phase=prepare,apply patches=20784036

Enter the APPS password:

Enter the SYSTEM password:

Enter the WLSADMIN password:

Validating credentials.

Initializing.

    Run Edition context  : /devapp/UAT/fs1/inst/apps/UAT_dev/appl/admin/UAT_dev.xml

    Patch edition context: /devapp/UAT/fs2/inst/apps/UAT_dev/appl/admin/UAT_dev.xml                                                                                    

Reading driver file (up to 50000000 bytes).

    Patch file system free space: 59.89 GB

Validating system setup.

    Node registry is valid.

Checking for existing adop sessions.