ERROR IN CONNECTING IN SQL PLUS(ORACLE DEVELOPER SUIT 10g)

hi Friends
I have just installed ORACLE DEVELOPER SUIT 10g. my DATABASE is ORACLE XE(express edition) and username ,password for database is "SYSTEM","*****".
when i log in SQL PLUS witn this user name and password ,and HOST STRING=XE.it shows an ERROR =             ORA-12154: TNS:could not tesolve the connect identifier specified.
my tnsname.ora is
XE =
  (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = ARUNSOROUT-PC)(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) )  )
please help me in solving this ERROR.

This forum is for the SQL Developer tool, not for general SQL or PL/SQL questions.  The clue is in the name.
Try asking in the Database General or SQL and PL/SQL forums.

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