Follow below steps to overcome this issue:
Just Copy your TNS file from your database and copy to below mentioned BI locations.
1) %MiddleWare_Home%\oracle_common\network\admin
2) %MiddleWare_Home%\Oracle_BI1\network\admin
If admin folder is not there .......just create admin folder and copy the TNS file.
Regarding BI Client Tool you can see my previous post.
OBIEE client tool is not connecting to Database : Error: Connection has failed