Oracle profile Tnsnames.ora new link after connection error: Ora-12154:tns: Unable to parse the specified identifier

Another space caused by the murder was also I met: in the TNSNames. Ora file in a new configuration, the configuration is estimated to be the copy of others directly pasted up, and then found that with PL/SQL connection has been an error, after the exclusion of user name and password problems and after careful look at the file only to find the new addition of the configuration of the first line WLF before a more obscure space:

wlf=

(DESCRIPTION =

(Address_list =

(ADDRESS = (PROTOCOL = TCP) (HOST = 127.0.0.1) (PORT = 1521))

)

(Content_data =

(service_name = ORCL)

)

)

Oracle profile Tnsnames.ora new link after connection error: Ora-12154:tns: Unable to parse the specified identifier