The error information is as follows, also hope you can help me with great god:

Map the name to dispid com.jacob.com.ComFailException: Can 't: SaveAs
The at com.jacob.com.Dispatch.invokev (Native Method)
At com.jacob.com.Dispatch.invokev Dispatch. Java: (858)
At com.jacob.com.Dispatch.callN Dispatch. Java: (455)
At com.jacob.com.Dispatch.call Dispatch. Java: (557)
At com. Ciic. CWS. Contract. Web. PdfTest. WordToPdf (pdfTest. Java: 91)
At com. Ciic. CWS. Contract. Web. PdfTest. PdfTest2 (pdfTest. Java: 117)
At sun. Reflect. NativeMethodAccessorImpl. Invoke0 (Native Method)
At sun. Reflect. NativeMethodAccessorImpl. Invoke (NativeMethodAccessorImpl. Java: 62)
At sun. Reflect. DelegatingMethodAccessorImpl. Invoke (43) DelegatingMethodAccessorImpl. Java:
The at Java. Lang. Reflect. Method. Invoke (498) Method. The Java:
The at org. Junit. Runners. Model. FrameworkMethod $1. RunReflectiveCall (FrameworkMethod. Java: 50)
The at org. Junit. Internal. Runners. Model. ReflectiveCallable. Run (ReflectiveCallable. Java: 12)
The at org. Junit. Runners. Model. FrameworkMethod. InvokeExplosively (FrameworkMethod. Java: 47)
The at org. Junit. Internal. Runners. Statements. InvokeMethod. Evaluate (InvokeMethod. Java: 17)