Interop type 'Microsoft.Office.Interop.Word.ApplicationClass' cannot be embedded. Use the applicable

错误信息：

Interop type 'Microsoft.Office.Interop.Word.ApplicationClass' cannot be embedded. Use the applicable interface instead.

解决方法：

In your Project, expand the "References", find the Microsoft Office Interop reference. Right click it and select properties, and change "Embed Interop Types" to false.

如下图：