Legacy ViewPPT macro can not view ppt

2015-06-26 17:32:13,394 ERROR [http-bio-8888-exec-9] [[Standalone].[localhost].[/].[servlet-module-container-servlet]] log Servlet.service() for servlet [servlet-module-container-servlet] in context with path [] threw exception [Servlet execution threw an exception] with root cause
java.lang.NoClassDefFoundError: com/google/common/io/ByteStreams
	at com.benryan.components.DefaultSlideCacheManager.transferDataToTempFile(DefaultSlideCacheManager.java:426)
	at com.benryan.components.DefaultSlideCacheManager.queueNewPptConversion(DefaultSlideCacheManager.java:302)
	at com.benryan.components.DefaultSlideCacheManager.queueNewConversion(DefaultSlideCacheManager.java:272)
	at com.benryan.components.DefaultSlideCacheManager.getFuture(DefaultSlideCacheManager.java:125)
	at com.benryan.components.DefaultSlideCacheManager.getFuture(DefaultSlideCacheManager.java:108)
	at com.benryan.components.DefaultSlideCacheManager.getSlideConversionData(DefaultSlideCacheManager.java:65)
	at com.benryan.conversion.PPTSlideServlet.doGet(PPTSlideServlet.java:99)
...