添加创建的excel加载项

I have created a VB add-in for excel with the below code. However, when I open a new excel workbook and attempt to add the reference to the newly created dll, I get an error: "Can't add a reference to the specified path." I am using Excel 2010 on a 32 bit machine. The add-in was created with Visual Studio 2010.I have created a VB add-in for excel with the b