我正在尝试在 Netbeans 中构建 GUI（我还安装了 Opengl Pack），但每次尝试拖动组件时，都会出现此错误：
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.