EDITED AUTH CONTROLLER

app/Http/Controllers/Backend/Setting/AuthenticationController.php

@@ -15,7 +15,7 @@ class AuthenticationController extends Controller
 {
     public function signUpForm()
     {
-        return view('backend.authentication.register');
+        return view('backend.Authentication.register');
     }
 
     public function signUpStore(SignUpRequest $request)
@@ -40,7 +40,7 @@ public function signUpStore(SignUpRequest $request)
 
     public function signInForm()
     {
-        return view('backend.authentication.login');
+        return view('backend.Authentication.login');
     }
 
     public function signInCheck(SignInRequest $request)