VSTO Outlook Addin (Member not found. (Exception from HRESULT: 0x80020003 (DISP_E_MEMBERNOTFOUND))) Error while deleting attachment

I am adding a contact thru Right Clicking a Outlook contact --> Forward Contact--> As a Business Card. . This will add a .vcf file as a attachment and a embedded image in the mail body. when user clicks my Addin i have to delete the .vcf attachment and provide a custom link to the user.

Now the problem is when i try to delete the attachment i am getting this Exception:

Member not found. (Exception from HRESULT: 0x80020003 (DISP_E_MEMBERNOTFOUND)) 

I get this exception only if i do Right Clicking a Outlook contact --> Forward Contact--> As a Business Card. If i drag and drop any file then i don't get any Exception while deleting that attachment.

As I am new to outlook plugin I am not sure where I am going wrong. Any suggestion would help me a lot.

Try to use any low-level property viewer tool such as MFCMAPI or OutlookSpy for observing properties. You can also may try to delete the attachment there. Do you get any errors in that case?