Very Strange Error In Net Beans.

Very Strange Error In NetBeans.
I am Java Developer and also used many JAVA tools for example JDK, JRE and JDeveloper. But now I download NetBeans from internet and install it in my system. Now I want GUI (Graphical User Interface ) Form. For I this purpose I go to file menu and Select New and then Select one Category then select its type such as JFormDesigner Form and then click at Next Button but same window appear again. This is Very Strange and confusable error for me. Any one tells me its solution.

