diff --git a/build/version.txt b/build/version.txt
index 835fcc8d..48f8d8b3 100644
--- a/build/version.txt
+++ b/build/version.txt
@@ -6,4 +6,4 @@
 #   Patch: Backwards compatible bug fixes only
 #   -Suffix (optional): a hyphen followed by a string denoting a pre-release version (rc1, rc2, etc.)
 
-9.0.0-rc1
+9.0.0-rc2
diff --git a/src/ClashOfClans.Models/ClientError.cs b/src/ClashOfClans.Models/ClientError.cs
index 8b7fb3c5..23c5503b 100644
--- a/src/ClashOfClans.Models/ClientError.cs
+++ b/src/ClashOfClans.Models/ClientError.cs
@@ -1,15 +1,14 @@
-using System;
-
-namespace ClashOfClans.Models
+namespace ClashOfClans.Models
 {
     /// <summary>
     /// Error message from the endpoint
     /// </summary>
-    [Serializable]
     public class ClientError
     {
         public string Reason { get; set; } = default!;
 
         public string Message { get; set; } = default!;
+
+        public override string ToString() => $"Reason '{Reason}', message '{Message}'";
     }
 }
diff --git a/src/ClashOfClans.Tests.Unit/ClashOfClansExceptionTests.cs b/src/ClashOfClans.Tests.Unit/ClashOfClansExceptionTests.cs
index 21f7249a..c370800a 100644
--- a/src/ClashOfClans.Tests.Unit/ClashOfClansExceptionTests.cs
+++ b/src/ClashOfClans.Tests.Unit/ClashOfClansExceptionTests.cs
@@ -1,7 +1,6 @@
 using ClashOfClans.Core;
 using ClashOfClans.Models;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
-using Newtonsoft.Json;
 
 namespace ClashOfClans.Tests.Unit
 {
@@ -22,25 +21,26 @@ public void ThrowClashOfClansException()
         }
 
         [TestMethod]
-        public void SerializeAndDeserializeClashOfClansExceptionUsingNewtonsoft()
+        public void ClashOfClansExceptionHasClientError()
         {
             // Arrange
             var error = new ClientError
             {
-                Message = "message",
-                Reason = "reason"
+                Reason = "Error reason",
+                Message = "Error message"
             };
-            var originalException = new ClashOfClansException(error);
 
-            // Act
-            var output = JsonConvert.SerializeObject(originalException);
-            var deserializedException = JsonConvert.DeserializeObject<ClashOfClansException>(output);
-
-            // Assert
-            Assert.IsNotNull(deserializedException);
-            Assert.AreEqual(originalException.Message, deserializedException.Message);
-            Assert.AreEqual(originalException.Error.Message, deserializedException.Error.Message);
-            Assert.AreEqual(originalException.Error.Reason, deserializedException.Error.Reason);
+            try
+            {
+                // Act
+                throw new ClashOfClansException(error);
+            }
+            catch (ClashOfClansException ex)
+            {
+                // Assert
+                Assert.AreEqual(error.Reason, ex.Error.Reason);
+                Assert.AreEqual(error.Message, ex.Error.Message);
+            }
         }
     }
 }
diff --git a/src/ClashOfClans/Core/ClashOfClansException.cs b/src/ClashOfClans/Core/ClashOfClansException.cs
index 42f714a2..ffdcb118 100644
--- a/src/ClashOfClans/Core/ClashOfClansException.cs
+++ b/src/ClashOfClans/Core/ClashOfClansException.cs
@@ -1,14 +1,11 @@
 using ClashOfClans.Models;
 using System;
-using System.Runtime.Serialization;
-using System.Security.Permissions;
 
 namespace ClashOfClans.Core
 {
     /// <summary>
     /// Represents errors that occur when communicating with the official Clash of Clans API
     /// </summary>
-    [Serializable]
     public class ClashOfClansException : Exception
     {
         /// <summary>
@@ -39,16 +36,6 @@ public ClashOfClansException(ClientError error)
             Error = error;
         }
 
-        protected ClashOfClansException(SerializationInfo info, StreamingContext context)
-            : base(info, context)
-        {
-            Error = (ClientError)info.GetValue(nameof(Error), typeof(ClientError))!;
-        }
-
-        public override void GetObjectData(SerializationInfo info, StreamingContext context)
-        {
-            base.GetObjectData(info, context);
-            info.AddValue(nameof(Error), Error);
-        }
+        public override string Message => Error.ToString();
     }
 }