NET Manager in Oracle cannot be configured

Cannot be configured today when configuring Oracle Net Manager, click the service name there is no node, Green Plus no response

Later on the internet is because there are spaces in the TNSNames file that cause

File path: oracle/product/10.2.0/db_1/network/admin

Format: Each time a service name is added, the file will generate a

223 =
(DESCRIPTION =
(Address_list =
(ADDRESS = (PROTOCOL = TCP) (HOST = 192.168.100.223) (PORT = 1521))
)
(Connect_data =
(service_name = sl223)
)
)

An empty line in the middle of each service name, and no spaces in front of the service name

NET Manager in Oracle cannot be configured