Reading control file error: For input string: "800     //plot width and height (in pixels)"

Exception in thread "main" java.lang.IllegalArgumentException: Width (0) and height (0) cannot be <= 0

at java.awt.image.DirectColorModel.createCompatibleWritableRaster(DirectColorModel.java:1016)

at java.awt.image.BufferedImage.<init>(BufferedImage.java:340)

at family_circle_plotter.main(family_circle_plotter.java:332)

请问老师这是哪里出错了