ora-12514 tns 监听程序当前无法识别连接描述符中请求的服务

我是在使用Navicat for Oracle 连接本地Oracle服务的时候，报 ora-12514 tns 监听程序当前无法识别连接描述符中请求的服务 异常

首先我是查看配置

D:\ysstech\soft\oracle\oracle11\product\11.2.0\dbhome_1\NETWORK\ADMIN     listener.ora　这个是我服务的安装目录

# listener.ora Network Configuration File: D:\ysstech\soft\oracle\oracle11\product\11.2.0\dbhome_1\NETWORK\ADMIN\listener.ora
# Generated by Oracle configuration tools.

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = CLRExtProc)
      (ORACLE_HOME = D:\ysstech\soft\oracle\oracle11\product\11.2.0\dbhome_1)
      (PROGRAM = extproc)
      (ENVS = "EXTPROC_DLLS=ONLY:D:\ysstech\soft\oracle\oracle11\product\11.2.0\dbhome_1\bin\oraclr11.dll")
    )--新添加的
  (SID_DESC = (SID_NAME = orcl) (ORACLE_HOME = D:\ysstech\soft\oracle\oracle11\product\11.2.0\dbhome_1) (SID_NAME = ORCL) )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = pc-PC)(PORT = 1521))
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
  )

ADR_BASE_LISTENER = D:\ysstech\soft\oracle\oracle11

　　发现缺少了对相关服务名的监听，所以添加了对ORCL的监听

     然后重启Oracle服务，连接正常