Error occured during WhatsApp registration tool (WART)

Question

I am living in India and and I given the number format as +91 955XXXXXXX , 91955XXXXXXX and 955XXXXXXX.

 

All time i am getting same error:

{"login":"955XXXXXXX","status":"fail","reason":"missing_param","param":"authkey"}

 

Please help me how can i use this tool for registration. 

 

see the password generating article in below link. 

https://www.c-sharpcorner.com/UploadFile/ansh06031982/send-message-on-whatsapp-number-using-web-service/