diff --git a/BusinessLogic/Entities/Configuration/EventSubscriberConfiguration.cs b/BusinessLogic/Entities/Configuration/EventSubscriberConfiguration.cs
index 4b3ab59..72426c6 100644
--- a/BusinessLogic/Entities/Configuration/EventSubscriberConfiguration.cs
+++ b/BusinessLogic/Entities/Configuration/EventSubscriberConfiguration.cs
@@ -1,7 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Text;
-
 namespace EventManager.BusinessLogic.Entities.Configuration
 {
     public class EventSubscriberConfiguration
diff --git a/BusinessLogic/Entities/Configuration/ExternalServiceConfiguration.cs b/BusinessLogic/Entities/Configuration/ExternalServiceConfiguration.cs
index 6713b4d..e04d3f2 100644
--- a/BusinessLogic/Entities/Configuration/ExternalServiceConfiguration.cs
+++ b/BusinessLogic/Entities/Configuration/ExternalServiceConfiguration.cs
@@ -1,5 +1,3 @@
-using System;
-
 namespace EventManager.BusinessLogic.Entities.Configuration
 {
     public class ExternalServiceConfiguration
diff --git a/BusinessLogic/Entities/Configuration/SubscriptionConfiguration.cs b/BusinessLogic/Entities/Configuration/SubscriptionConfiguration.cs
index bf580db..d7a1079 100644
--- a/BusinessLogic/Entities/Configuration/SubscriptionConfiguration.cs
+++ b/BusinessLogic/Entities/Configuration/SubscriptionConfiguration.cs
@@ -1,6 +1,4 @@
-using System;
 using System.Collections.Generic;
-using System.Text;
 
 namespace EventManager.BusinessLogic.Entities.Configuration
 {
diff --git a/BusinessLogic/Entities/Exceptions/CustomAuthFailureException.cs b/BusinessLogic/Entities/Exceptions/CustomAuthFailureException.cs
index b9aa8b5..2fdf142 100644
--- a/BusinessLogic/Entities/Exceptions/CustomAuthFailureException.cs
+++ b/BusinessLogic/Entities/Exceptions/CustomAuthFailureException.cs
@@ -1,21 +1,13 @@
-using EventManager.BusinessLogic.Entities.Configuration;
-using EventManager.BusinessLogic.Extensions;
-using EventManager.BusinessLogic.Interfaces;
-using Serilog;
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Net.Http;
-using System.Threading.Tasks;
 
 namespace EventManager.BusinessLogic.Entities.Exceptions
 {
-    [System.Serializable]
-    public class CustomAuthFailureException : System.Exception
+    [Serializable]
+    public class CustomAuthFailureException : Exception
     {
         public CustomAuthFailureException() { }
         public CustomAuthFailureException(string message) : base(message) { }
-        public CustomAuthFailureException(string message, System.Exception inner) : base(message, inner) { }
+        public CustomAuthFailureException(string message, Exception inner) : base(message, inner) { }
         protected CustomAuthFailureException(
             System.Runtime.Serialization.SerializationInfo info,
             System.Runtime.Serialization.StreamingContext context) : base(info, context) { }