While conversion an exception happens and the conversion fails. The file is attached.
com.aspose.slides.PptxException: reading animation group failed.
at com.aspose.slides.TimeLineEx.do(Unknown Source)
at com.aspose.slides.LayoutSlideEx.do(Unknown Source)
at com.aspose.slides.LayoutSlideEx.(Unknown Source)
at com.aspose.slides.PresentationEx.do(Unknown Source)
at com.aspose.slides.PresentationEx.int(Unknown Source)
at com.aspose.slides.PresentationEx.if(Unknown Source)
at com.aspose.slides.PresentationEx.(Unknown Source)
at com.aspose.slides.PresentationEx.(Unknown Source)
at com.PowerPointToPNGConverter.convert(PowerPointToPNGConverter.java:105)
at com..ConversionTask.call(ConversionTask.java:49)
at com.*******.ConversionTask.call(ConversionTask.java:16)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException