ERROR 12545 : Connect failed because target host or object doesn't exist while trying to connect sqlplus

I want to install oracle instant client but I have been stuck while I was trying to remote DB. I always got error ORA-12545, but my oracle DB is active and works fine.. i already started listener and config /etc/host on both side.

Here's my tnsnames.ora configuration on Oracle Database server:

ROLFSAN =  (DESCRIPTION =    (ADDRESS = (PROTOCOL = TCP)(HOST = ullabritta)(PORT = 1521))    (CONNECT_DATA =      (SERVER = DEDICATED)      (SERVICE_NAME = rolf)    )  )

and here's my tnsname.ora configuration on oracle instant :

SVEN = -- i give this name as i wish, there's no sven on oracle database  (DESCRIPTION =    (ADDRESS = (PROTOCOL = TCP)(HOST = ullabritta)(PORT = 1521))    (CONNECT_DATA =      (SERVER = DEDICATED)      (SERVICE_NAME = rolf)    )  )

did i do something wrong? or there's specific configuration on oracle database server??