diff --git a/lib/data/services/api_client.dart b/lib/data/services/api_client.dart
index 3bc766a..631c406 100644
--- a/lib/data/services/api_client.dart
+++ b/lib/data/services/api_client.dart
@@ -1,7 +1,6 @@
 import 'dart:convert';
 
-import 'package:flutter/rendering.dart';
-import 'package:flutter/widgets.dart';
+import 'package:flutter/material.dart';
 import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 import 'package:http/http.dart';
 import 'package:logger/logger.dart';
@@ -312,14 +311,18 @@ class ApiClient {
     try {
       final headers = await _getHeaders();
       final response = await client.get(Uri.parse(url), headers: headers);
-      if (response.statusCode == 200) {
-        final json = jsonDecode(response.body) as List<dynamic>;
-        return Result.ok(json.map((element) => Bal.fromJSON(element)).toList());
-      } else {
-        throw Exception("Something wrong happened");
+
+      switch (response.statusCode) {
+        case 200:
+          final json = jsonDecode(response.body) as List<dynamic>;
+          return Result.ok(
+            json.map((element) => Bal.fromJSON(element)).toList(),
+          );
+        default:
+          throw "Unknown error with code ${response.statusCode.toString()}";
       }
     } catch (e) {
-      debugPrint("ERROR: ${e.toString()}");
+      log.e(e.toString());
       return Result.error(Exception(e));
     } finally {
       client.close();
@@ -361,13 +364,17 @@ class ApiClient {
     try {
       final headers = await _getHeaders();
       final response = await client.get(Uri.parse(url), headers: headers);
-      if (response.statusCode == 200) {
-        final json = jsonDecode(response.body);
-        return Result.ok(Book.fromJSON(json));
-      } else {
-        throw Exception("The book was not found");
+      switch (response.statusCode) {
+        case 200:
+          final json = jsonDecode(response.body);
+          return Result.ok(Book.fromJSON(json));
+        case 404:
+          throw "No book with this id exists in database";
+        default:
+          throw "Unknown error with code ${response.statusCode.toString()}";
       }
     } catch (e) {
+      log.e(e.toString());
       return Result.error(Exception("API $e"));
     } finally {
       client.close();
@@ -381,13 +388,17 @@ class ApiClient {
     try {
       final headers = await _getHeaders();
       final response = await client.get(Uri.parse(url), headers: headers);
-      if (response.statusCode == 200) {
-        final json = jsonDecode(response.body);
-        return Result.ok(Book.fromJSON(json));
-      } else {
-        throw Exception("The book was not found");
+      switch (response.statusCode) {
+        case 200:
+          final json = jsonDecode(response.body);
+          return Result.ok(Book.fromJSON(json));
+        case 404:
+          throw "No book with this EAN found in the database of BNF";
+        default:
+          throw "Unknown error with code ${response.statusCode.toString()}";
       }
     } catch (e) {
+      log.e(e.toString());
       return Result.error(Exception("API $e"));
     } finally {
       client.close();
@@ -416,13 +427,19 @@ class ApiClient {
         headers: headers,
         body: body,
       );
-      if (response.statusCode == 200) {
-        final json = jsonDecode(response.body) as List<dynamic>;
-        return Result.ok(json.map((el) => SearchResult.fromJSON(el)).toList());
-      } else {
-        throw "Unknown Error";
+      switch (response.statusCode) {
+        case 200:
+          final json = jsonDecode(response.body) as List<dynamic>;
+          return Result.ok(
+            json.map((el) => SearchResult.fromJSON(el)).toList(),
+          );
+        case 403:
+          throw "You do not own the BAL";
+        default:
+          throw "Unknown error with code ${response.statusCode.toString()}";
       }
     } catch (e) {
+      log.e(e.toString());
       return Result.error(Exception("API $e"));
     } finally {
       client.close();
@@ -440,13 +457,19 @@ class ApiClient {
     try {
       final headers = await _getHeaders();
       final response = await client.get(Uri.parse(url), headers: headers);
-      if (response.statusCode == 200) {
-        final json = jsonDecode(response.body) as List<dynamic>;
-        return Result.ok(json.map((el) => BookInstance.fromJSON(el)).toList());
-      } else {
-        throw "Unknown Error";
+      switch (response.statusCode) {
+        case 200:
+          final json = jsonDecode(response.body) as List<dynamic>;
+          return Result.ok(
+            json.map((el) => BookInstance.fromJSON(el)).toList(),
+          );
+        case 403:
+          throw "You do not own the BAL";
+        default:
+          throw "Unknown error with code ${response.statusCode.toString()}";
       }
     } catch (e) {
+      log.e(e.toString());
       return Result.error(Exception("API $e"));
     } finally {
       client.close();
@@ -465,12 +488,20 @@ class ApiClient {
         headers: headers,
         body: body,
       );
-      if (response.statusCode == 200) {
-        return Result.ok(response.statusCode);
-      } else {
-        throw "Unknown error";
+      switch (response.statusCode) {
+        case 200:
+          return Result.ok(response.statusCode);
+        case 403:
+          throw "You don't own one of the specified books";
+        case 404:
+          throw "One of the books was not found";
+        case 409:
+          throw "One of the books wasn't available";
+        default:
+          throw "Unknown error with code ${response.statusCode.toString()}";
       }
     } catch (e) {
+      log.e(e.toString());
       return Result.error(Exception(e));
     } finally {
       client.close();
@@ -499,13 +530,14 @@ class ApiClient {
         headers: headers,
         body: body,
       );
-      if (response.statusCode == 201) {
-        final json = jsonDecode(response.body);
-        return Result.ok(BookInstance.fromJSON(json));
-      } else if (response.statusCode == 403) {
-        throw Exception("You don't own that book instance");
-      } else {
-        throw Exception("Something wrong happened");
+      switch (response.statusCode) {
+        case 201:
+          final json = jsonDecode(response.body);
+          return Result.ok(BookInstance.fromJSON(json));
+        case 403:
+          throw "You don't own that book instance";
+        default:
+          throw "Unknown error with code ${response.statusCode.toString()}";
       }
     } catch (e) {
       return Result.error(Exception(e));
@@ -527,13 +559,19 @@ class ApiClient {
     try {
       final headers = await _getHeaders();
       final response = await client.get(Uri.parse(url), headers: headers);
-      if (response.statusCode == 200) {
-        final json = jsonDecode(response.body);
-        return Result.ok(Owner.fromJSON(json));
-      } else {
-        throw Exception("The owner was not found");
+      switch (response.statusCode) {
+        case 200:
+          final json = jsonDecode(response.body);
+          return Result.ok(Owner.fromJSON(json));
+        case 403:
+          throw "You do not own specified owner";
+        case 404:
+          throw "No owner with this id exists";
+        default:
+          throw "Unknown error with code ${response.statusCode.toString()}";
       }
     } catch (e) {
+      log.e(e.toString());
       return Result.error(Exception("API $e"));
     } finally {
       client.close();
@@ -547,13 +585,15 @@ class ApiClient {
     try {
       final headers = await _getHeaders();
       final response = await client.get(Uri.parse(url), headers: headers);
-      if (response.statusCode == 200) {
-        final json = jsonDecode(response.body);
-        return Result.ok(Owner.fromJSON(json));
-      } else {
-        throw "Unknown error";
+      switch (response.statusCode) {
+        case 200:
+          final json = jsonDecode(response.body);
+          return Result.ok(Owner.fromJSON(json));
+        default:
+          throw "Unknown error with code ${response.statusCode.toString()}";
       }
     } catch (e) {
+      log.e(e.toString());
       return Result.error(Exception(e));
     } finally {
       client.close();
@@ -568,13 +608,14 @@ class ApiClient {
     try {
       final headers = await _getHeaders();
       final response = await client.get(Uri.parse(url), headers: headers);
-      if (response.statusCode == 200) {
-        final json = jsonDecode(response.body) as List<dynamic>;
-        return Result.ok(
-          json.map((element) => Owner.fromJSON(element)).toList(),
-        );
-      } else {
-        throw Exception("Invalid request");
+      switch (response.statusCode) {
+        case 200:
+          final json = jsonDecode(response.body) as List<dynamic>;
+          return Result.ok(
+            json.map((element) => Owner.fromJSON(element)).toList(),
+          );
+        default:
+          throw "Unknown error with code ${response.statusCode.toString()}";
       }
     } on Exception catch (error) {
       return Result.error(error);
@@ -604,14 +645,16 @@ class ApiClient {
         headers: headers,
         body: jsonEncode(body),
       );
-      if (response.statusCode == 201) {
-        final json = jsonDecode(response.body);
-        return Result.ok(Owner.fromJSON(json));
-      } else {
-        throw Exception("Invalid request");
+      switch (response.statusCode) {
+        case 201:
+          final json = jsonDecode(response.body);
+          return Result.ok(Owner.fromJSON(json));
+        default:
+          throw "Unknown error with code ${response.statusCode.toString()}";
       }
-    } on Exception catch (error) {
-      return Result.error(error);
+    } catch (e) {
+      log.e(e.toString());
+      return Result.error(Exception(e));
     } finally {
       client.close();
     }
diff --git a/lib/routing/router.dart b/lib/routing/router.dart
index c330f51..3c3cdb8 100644
--- a/lib/routing/router.dart
+++ b/lib/routing/router.dart
@@ -72,11 +72,6 @@ GoRouter router(AuthRepository authRepository) => GoRouter(
             );
             return NoTransitionPage(child: AddPage(viewModel: viewModel));
           },
-          // routes: [
-          // GoRoute(path: Routes.addForm),
-          // GoRoute(path: Routes.addOwner),
-          // GoRoute(path: Routes.addPrice),
-          // ],
         ),
         GoRoute(
           path: Routes.sell,