Forms Running

Hello
I'm facing problem in running Oracle 10g for first time
my database on server win2000
and OC4J running
Jinit working , but when I run the form
the next error message appear on Java Console and on the Browser
"JAVA.LANG.CLASS Not found Exception :Oracle.forms.engine.main"
can any one help and tell me what I have to do for solving this problem ASAP?

i just Installed The oracle forms 10g today for urgent project
and i allready runned the Jinit towice one from my control panel and the other from Oracle direcrory
and the form which i'm trying to test it's the testform through the web form tester
i can not start till now to face a reall troubles with my complicated forms
and the java console error mesage is
load: class oracle.forms.engine.Main not found.
java.lang.ClassNotFoundException: java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
and etc.......

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