icedteanp plugin error: Failed to run /usr/lib/jvm/java-6-openjdk/jre/bin/java

I tried to open http://www.geogebra.org/webstart/geogebra.html using Chromium.

icedteanp plugin error: Failed to run /usr/lib/jvm/java-6-openjdk/jre/bin/java. For more detail rerun "firefox -g" in a terminal window.

ubuntu@Ubuntu:~$ firefox -g
GNU gdb (Ubuntu/Linaro 7.3-0ubuntu2) 7.3-2011.08
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://bugs.launchpad.net/gdb-linaro/>...
Reading symbols from /usr/lib/firefox-8.0/firefox...(no debugging symbols found)...done.
(gdb) run
Starting program: /usr/lib/firefox-8.0/firefox
[Thread debugging using libthread_db enabled]

(firefox:8830): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",

(firefox:8830): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",

(firefox:8830): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",

(firefox:8830): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
[New Thread 0x7fffe9af1700 (LWP 8834)]
[New Thread 0x7fffe8e69700 (LWP 8835)]
[New Thread 0x7fffe8668700 (LWP 8836)]
[New Thread 0x7fffe7bff700 (LWP 8837)]
[New Thread 0x7fffe6372700 (LWP 8838)]
[New Thread 0x7fffe5b71700 (LWP 8839)]
[New Thread 0x7fffe44ff700 (LWP 8840)]
[New Thread 0x7fffe3cfe700 (LWP 8841)]
[New Thread 0x7fffe23e5700 (LWP 8842)]
[New Thread 0x7fffe19ff700 (LWP 8843)]
[New Thread 0x7fffe0eff700 (LWP 8844)]
[New Thread 0x7fffe06fe700 (LWP 8845)]
[New Thread 0x7fffdfefd700 (LWP 8846)]
[Thread 0x7fffe06fe700 (LWP 8845) exited]
[Thread 0x7fffe0eff700 (LWP 8844) exited]
[Thread 0x7fffe23e5700 (LWP 8842) exited]
[New Thread 0x7fffdf6fc700 (LWP 8847)]
[Thread 0x7fffdfefd700 (LWP 8846) exited]
[New Thread 0x7fffdfefd700 (LWP 8848)]
[Thread 0x7fffdfefd700 (LWP 8848) exited]
[New Thread 0x7fffdfefd700 (LWP 8851)]
[New Thread 0x7fffe06fe700 (LWP 8852)]
[New Thread 0x7fffe0eff700 (LWP 8853)]
[New Thread 0x7fffe23e5700 (LWP 8854)]
[Thread 0x7fffe23e5700 (LWP 8854) exited]
[New Thread 0x7fffe23e5700 (LWP 8855)]
[New Thread 0x7fffdbfff700 (LWP 8856)]
[Thread 0x7fffdf6fc700 (LWP 8847) exited]
[New Thread 0x7fffdb5ff700 (LWP 8857)]
[New Thread 0x7fffdadfe700 (LWP 8858)]
[New Thread 0x7fffda5fd700 (LWP 8859)]
[New Thread 0x7fffdf6fc700 (LWP 8860)]
[New Thread 0x7fffd93e4700 (LWP 8861)]
[New Thread 0x7fffd8be3700 (LWP 8862)]
[New Thread 0x7fffd80ff700 (LWP 8863)]
[New Thread 0x7fffd76ff700 (LWP 8864)]
[New Thread 0x7fffd59ff700 (LWP 8865)]
[New Thread 0x7fffd1db0700 (LWP 8866)]
/build/buildd/icedtea-web-1.1.3/build/../plugin/icedteanp/IcedTeaNPPlugin.cc:1500: thread 0x7ffff6d1ea40: Error: Failed to spawn applet viewer: Failed to execute child process "/usr/lib/jvm/java-6-openjdk/jre/bin/java" (No such file or directory)
[Thread 0x7fffe6372700 (LWP 8838) exited]
/build/buildd/icedtea-web-1.1.3/build/../plugin/icedteanp/IcedTeaNPPlugin.cc:1500: thread 0x7ffff6d1ea40: Error: Failed to spawn applet viewer: Failed to execute child process "/usr/lib/jvm/java-6-openjdk/jre/bin/java" (No such file or directory)