Cirtificate not Verified?..

[Needsumhelp]

I'm trying to get onto this IRC webchat, but whenever I try to load it I get a popup saying

"Cirtificate not verified
Code will be treated as unsigned"

When I click the "more info" button, I get this text:

"java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
at java.util.LinkedList.entry(LinkedList.java:368)
at java.util.LinkedList.get(LinkedList.java:313)
at com.sun.deploy.security.MacOSXTrustDecider.isAllPermissionGranted(MacOSXTrustDecider.java: 151)
at com.sun.deploy.security.MacOSXTrustDecider.isAllPermissionGranted(MacOSXTrustDecider.java: 76)
at sun.plugin.security.PluginClassLoader.getPermissions(PluginClassLoader.java:146)
at java.security.SecureClassLoader.getProtectionDomain(SecureClassLoader.java:192)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:147)
at java.lang.ClassLoader.loadClass(ClassLoader.java:316)
at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:119)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:591)
at sun.applet.AppletPanel.createApplet(AppletPanel.java:723)
at sun.plugin.AppletViewer.createApplet(AppletViewer.java:1870)
at sun.applet.AppletPanel.runLoader(AppletPanel.java:652)
at sun.applet.AppletPanel.run(AppletPanel.java:326)
at java.lang.Thread.run(Thread.java:613)"

I tried going into cirtificates in keychain axcess and trusting the one that said "webchat", but it didn't make a difference.

Can someone help?