importContent(slide) failed,or how to clone a slide?

[goobycle]

I am  experiencing a normal problem using poi 3.15-beta2.
code： 
XMLSlideShow pptx = new XMLSlideShow(new FileInputStream(PPT_TEMPLATE));
XSLFSlide slide = pptx.getSlides()[0]; 
pptx.createSlide().importContent(slide); 
OutputStream out = new
FileOutputStream("output/pie-chart-demo-output.pptx");
pptx.write(out); 
out.close(); 

when I open the pie-chart-demo-output.pptx,there will be a problem to fix.
And fixing over,the copy slide disappears.Is Your problem solved? How to do
? Help me.Many thanks.



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