If your still using the default AuthController, there is a validation line that references the users table.

You will need to update this : 'email' => 'required|email|max:255|unique:users',

/**
     * Get a validator for an incoming registration request.
     *
     * @param  array  $data
     * @return \Illuminate\Contracts\Validation\Validator
     */
    protected function validator(array $data)
    {
        return Validator::make($data, [
            'name' => 'required|max:255',
            'email' => 'required|email|max:255|unique:users',
            'password' => 'required|confirmed|min:6',
        ]);
    }

thank u so much for reply.i have tried this but its not getting me logged in. please help