I am using external libraries payu money sdk and linkedin-sdk, both uses volley libraries, which while compiling project gives duplicate entry of AuthFailureError.class
Just remove your volley library from dependancy.
Try clean and rebuild project it works for me.
Ex. payusdk are also implementing volley library so that is the reason exception shows duplicate entry. I hope it works. because i also found this error and i do these things it works.
Thanks.