Getting Error : send whatsapp message from c#

Question

I have done with all the nuget package manager process,but getting the following error

please see :

https://goo.gl/uTjw48

https://goo.gl/u9E8mO

https://goo.gl/Z1cZL0

Chandu Kumawat · Answer

http://www.c-sharpcorner.com/code/2085/send-image-audio-video-and-message-from-C-Sharp-to-whatsapp.aspx refer this

Chandu Kumawat · Answer

to prevent this error u must use whatsapp.dll file from WHATSAPP CHAT API FOR.NET available so search WHATSAPP CHAT API FOR.NET on Github