applet no loading please check  ;D

Java Plug-in 1.6.0_17
Using JRE version 1.6.0_17-b04 Java HotSpot(TM) Client VM


load: class users.ntnu.fkh.thinlensintensity_pkg.thinlensintensityApplet.class not found.
java.lang.ClassNotFoundException: users.ntnu.fkh.thinlensintensity_pkg.thinlensintensityApplet.class
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:http://www.phy.ntnu.edu.tw/ntnujava/ejs4/users/ntnu/fkh/thinlensintensity_pkg/thinlensintensityApplet/class.class
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 7 more