Connecting my first database in Oracle 8i personal win 98

I installed 8i on my personal machine. Created my database called gradenet. Created my Listener and Service name of gr2001.
When I go to connect it gives me the an error: TNS:listener could not resolve SERVICE_NAME given in connect description..
I have looked at some on line documentation, it is claiming that
I might have a problem in the Oracle Names server definitions and to verify the SQLNET.ORA. that contains a names directory_path parameter for a list of naming methods.
can someone explain what it is I am needing to correct to make the serve connect ?

This is a generic error message which may be vague.
I have a LAN of two machines with HOST and DOMAIN names specified ("Webserver" and "Arcade") in the Start/Settings/Control Panel/Network/Identification and ...Network/Configuration/TCP-IP(protocol)<-(adapter binding)/Properties dialogs. If you are configuring a stand-alone machine, I can't help (helpless myself).
===========
My TNSNAMES.ORA for 2 databases and PL/SQL connection:
# TNSNAMES.ORA Network Configuration File: c:\Oracle\Ora81\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
DEMO.ICUBEDCORP.COM =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = Webserver)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = demo.icubedcorp.com)
SERVICES.ICUBEDCORP.COM =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = Webserver)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = services.icubedcorp.com)
===============
My SQLNET.ORA:
# SQLNET.ORA Network Configuration File: c:\Oracle\Ora81\NETWORK\ADMIN\sqlnet.ora
# Generated by Oracle configuration tools.
SQLNET.CLIENT_REGISTRATION = Webserver
NAMES.DEFAULT_DOMAIN = icubedcorp.com
TRACE_DIRECTORY_SERVER = c:\Oracle\Ora81\network\trace
TRACE_FILE_SERVER = svr_1.trc
LOG_DIRECTORY_SERVER = c:\Oracle\Ora81\network\log
NAMES.DIRECTORY_PATH= (TNSNAMES)
==============================
My LISTENER.ORA:
# LISTENER.ORA Network Configuration File: c:\Oracle\Ora81\NETWORK\ADMIN\listener.ora
# Generated by Oracle configuration tools.
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = Webserver)(PORT = 1521))
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = Webserver)(PORT = 2481))
(PROTOCOL_STACK =
(PRESENTATION = GIOP)
(SESSION = RAW)
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = c:\Oracle\Ora81)
(PROGRAM = extproc)
(SID_DESC =
(GLOBAL_DBNAME = demo.icubedcorp.com)
(ORACLE_HOME = c:\Oracle\Ora81)
(SID_NAME = demo)
(SID_DESC =
(GLOBAL_DBNAME = services.icubedcorp.com)
(ORACLE_HOME = c:\Oracle\Ora81)
(SID_NAME = services)

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