ALTER SYSTEM SET LOG_ARCHIVE_DEST_1='LOCATION=h:\oradata\archive' SCOPE=BOTH;

ERROR at line 1:
ORA-02097: parameter cannot be modified because specified value is invalid
ORA-16019: cannot use LOG_ARCHIVE_DEST_1 with LOG_ARCHIVE_DEST or LOG_ARCHIVE_DUPLEX_DEST

Solution :

1. Reset the LOG_ARCHIVE_DEST to NULL value :

   SQL> ALTER SYSTEM set log_archive_dest='';

2. Set the LOG_ARCHIVE_DEST_1 to the value set to LOG_ARCHIVE_DEST before
  
   SQL> ALTER SYSTEM set log_archive_dest_1='LOCATION=/...';

if you use this code, you dont need to restart database:

ALTER SYSTEM SET LOG_ARCHIVE_DEST_1='LOCATION=h:\oradata\archive' SCOPE=BOTH; 

To check archival destination issue is ok:

show parameter LOG_ARCHIVE_DEST; 
select DEST_ID, DEST_NAME,DESTINATION from v$archive_dest;