lync共享ppt时报错：很抱歉，PowerPoint Online打开刺眼时文稿时遇到问题。要查看此演示文稿，请在Microsoft PowerPoint中打开它
在oos服务器上查看日志，对应以下报错信息：
8:53:05.20 w3wp.exe#WebPPTViewer (0x19CC)
0x6698 Hosted Office Online PowerPoint Web Services apvsm Monitorable Exception Translated to ErrorCode: ErrorCode=ErrorWacConversionWorkerException,
ErrorTitle:{webappfull}, ErrorMessage很抱歉，{webappshort} 打开此{doctype}时遇到问题。 要查看此{doctype}，请在 {richclientfull} 中打开它。, ErrorActions=Close, OpenInClient ,ExceptionThrown=Microsoft.Office.Server.Powerpoint.Pipe.Interface.PipeApplicationException: ErrorWacConversionWorkerException
at Microsoft.Office.Web.Common.AsyncResult`1.WaitForCompletion() at Microsoft.Office.Server.Powerpoint.Web.Services.PptViewingService.EndGetImageResourceInternal(IAsyncResult result) at Microsoft.Office.Server.Powerpoint.Web.Services.WebMethodExecuteHandler.ExecuteInternal(HttpContext
context, Func`1 webMethodHandler, IPerfEventHandler perfEventHandler, Boolean fCheckWebIsEnabled, Boolean fSetAffinity) WacConversionResultErrorInfo; ItemRetrivalStatus: ConversionError; ErrorCode: ErrorWacConversionWorkerException; ConversionResult: WorkerException;
8fd2e79e-911e-436f-9967-f4ed4e4e861f
请问出现这个问题是什么原因？
