Remote Log Archive Destination

Hi Experts,

     How can I add additional log archive destination which is remote server.

     I tried to use the following below but i throws me an error. please help

    SQL>alter database noarchivelog;

    SQL>shutdown immediate

    SQL>startup

    SQL>alter system set log_archive_dest_1='Service=PRD_Z' scope=spfile;

    SQL>shutdown immediate

    SQL>startup mount

     ORA-16019: cannot use LOG_ARCHIVE_DEST_2 with LOG_ARCHIVE_DEST or LOG_ARCHIVE_DU

     PLEX_DEST

     or my procedures are wrong? please help me or tell me how to add additional archive destination(remote server)

thanks