Custom product tops have not been added correctly.

[benard]

Phase: prepare
Log: /d01/oracle/LASGPROD/new_fs/fs_ne/EBSapps/log/adop/9/adop_20160811_121642.log
===========================================================================

Validating configuration on node: [apps1].
    Log: /d01/oracle/LASGPROD/new_fs/fs_ne/EBSapps/log/adop/9/prepare_20160811_121642/LASGDEV_apps1
        [ERROR]: Custom product tops have not been added correctly.
        [WARNING]: Either some of the required entries in /etc/hosts file might be missing (e.g. localhost or hostname) OR the file /etc/hosts could not be read.
    [UNEXPECTED]Error occurred running "perl /d01/oracle/LASGPROD/new_fs/fs1/EBSapps/appl/ad/12.0.0/patch/115/bin/txkADOPValidations.pl  -contextfile=/d01/oracle/LASGPROD/new_fs/fs1/inst/apps/LASGDEV_apps1/appl/admin/LASGDEV_apps1.xml -patchctxfile=/d01/oracle/LASGPROD/new_fs/fs2/inst/apps/LASGDEV_apps1/appl/admin/LASGDEV_apps1.xml -phase=prepare -logloc=/d01/oracle/LASGPROD/new_fs/fs_ne/EBSapps/log/adop/9/prepare_20160811_121642/LASGDEV_apps1 -promptmsg=hide"
    [UNEXPECTED]Error 1 occurred while Executing txkADOPValidation script on apps1

[ErmanArslansOracleBlog]

Did you check this in the first place?
   [WARNING]: Either some of the required entries in /etc/hosts file might be missing (e.g. localhost or hostname) OR the file /etc/hosts could not be read.

I mean /etc/hosts

[ErmanArslansOracleBlog]

Also write your concern in details.
Don't put some logs without saying anything and wait for an answer!