SAP B1 Studio 9.7 - Error : There is an error in XML document (0, 0)

Hi Friends,

I am using SAP B1 Studio PL-9.7 for form designing. 

But now a days i could not open this B1 Studio because of this error :

               "System.InvalidOperationException: There is an error in XML document (0, 0). ---> System.Xml.XmlException: Root element is missing."

When open this SAP B1 Studio, it shows one dialog box with the above error. I attached the dialog box image with this.  Please help me..

Advance Thanks,

Indra.