无法在Netbeans中编辑GUI

Question

我正在尝试在Netbeans中构建GUI（我还安装了Opengl Pack），但每次我尝试拖动组件时，都会收到此错误：

Cannot load component class javax.media.opengl.GLCanvas 
from JAR file C:\Program Files (x86)\NetBeans 7.3.

The class could not be found. Note the class must be 
compiled and must be part of the sources or dependencies 
of the project where the target GUI form belongs to.