侦听器拒绝了连接,出现以下错误:ORA-12514,TNS:侦听器当前不知道连接描述符中请求的服务

我在尝试连接到远程数据库时出错我已经检查了侦听器和服务,它们工作正常

这是我的名字。ora文件

       XE =
   (DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
  (SERVER = DEDICATED)
  (SERVICE_NAME = XE)
)
)

    EXTPROC_CONNECTION_DATA =
  (DESCRIPTION =
 (ADDRESS_LIST =
   (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
  )
   (CONNECT_DATA =
  (SID = PLSExtProc)
  (PRESENTATION = RO)
  )
 )

 ORACLR_CONNECTION_DATA = 
 (DESCRIPTION = 
  (ADDRESS_LIST = 
  (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1)) 
  ) 
  (CONNECT_DATA = 
  (SID = CLRExtProc) 
  (PRESENTATION = RO) 
 ) 
) 
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