我在虚拟机中设置Oracle时遇到此错误：TNS:Listener does not currently know of SID given in connect descriptor .
下面是我在Virtual Box上下载Oracle所采取的步骤：
1.已下载VirtualBox 5.2.0。
1.已获取Oracle数据库开发人员虚拟机文件（开发人员日VM 2017 -06-13_01.ova）。
1.已在虚拟箱中打开文件，并从虚拟箱中打开。
1.现在，当我在我的Mac机器上进入Sql Developer，并试图在Virtual Box中连接到oracle时，我得到了上面的错误。

出于某种原因当我这样做：telnet 127.0.0.1 1521看起来是可以的。但是当我通过Sql Developer做的时候，我在上面的图片中看到了红色的错误。有人能给予我一些提示吗？
我的tnsnames.ora文件：

ORCL12C =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl12c)
    )
  )

LISTENER_ORCL12C =
  (ADDRESS = (PROTOCOL = TCP)(HOST = 0.0.0.0)(PORT = 1521))

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

listeners.ora档案：

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME = orcl12c)
      (SID_NAME = orcl12c)
      (ORACLE_HOME = /u01/app/oracle/product/12.2/db_1)
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
      (ADDRESS = (PROTOCOL = TCP)(HOST = 0.0.0.0)(PORT = 1521))
    )
  )

#HOSTNAME by pluggable not working rstriction or configuration error.
DEFAULT_SERVICE_LISTENER = (orcl12c)