我在processing中编译了这段代码 提示有很多错误ava lib Version = RXTX-2.1-7
java.lang.NullPointerException
at java.io.DataInputStream.readInt(DataInputStream.java:370)
at processing.core.PFont.<init>(PFont.java:336)
at processing.core.PApplet.loadFont(PApplet.java:6198)
at import_processing_serial.setup(import_processing_serial.java:48)
at processing.core.PApplet.handleDraw(PApplet.java:2241)
at processing.opengl.PGL$PGLListener.display(PGL.java:3240)
at jogamp.opengl.GLDrawableHelper.displayImpl(GLDrawableHelper.java:573)
at jogamp.opengl.GLDrawableHelper.display(GLDrawableHelper.java:558)
at javax.media.opengl.awt.GLCanvas$6.run(GLCanvas.java:1049)
at jogamp.opengl.GLDrawableHelper.invokeGLImpl(GLDrawableHelper.java:102
哪位大哥教教我怎么回事啊?