Cannot Load XWINDOWS

Good Afternoon,

I have a problem in my system,

I cannot load xwindows when I execute some kind of BI Cognos script for load GUI,

This is the error log :

bash-3.00$./cogconfig.sh

Using /usr/jdk/instance/jdk1.6.0_26/bin/java

05/11/2015,18:12:42,Err,java.lang.NoClassDefFoundError: Could not initialize class sun.awt.X11GraphicsEnvironment,

Exception in thread "main" java.lang.NoClassDefFoundError: Could not initialize class sun.awt.X11GraphicsEnvironment,

                 at java.lang.Class.forName0 (Native Method)

                 at java.lang.Class.forName (Class.java:169)

                 at java.awt.GraphicsEnvironment.getLocalGraphicEnvironment (GraphicsEnvironment.java:68)

                 at java.awt.Window.init (Window.java:380)

                 at java.awt.Window.<init> (Window.java:433)