Cannot connect to newly created schema in Oracle18c. Giving Listener does not know of SID error

Question

I am creating a new Schema in Oracle 18c. Schema is created successfully. But when i try to connect to this schema, i get an error saying:

Status : Failure -Test failed: Listener refused the connection with the following error: ORA-12514, TNS:listener does not currently know of service requested in connect descriptor

This is my listener.ora file:

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = CLRExtProc)
      (ORACLE_HOME = D:\Oracle18c)
      (PROGRAM = extproc)
      (ENVS = "EXTPROC_DLLS=ONLY:D:\Oracle18c\bin\oraclr18.dll")
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
  )