How to resolve System.RuntimeType is inaccessible due to its protection level. Only public types can be processed.?
<p>I am trying to serialize my class. But i got the following exception,</p>

<pre><code>  System.InvalidOperationException was unhandled
  HResult=-2146233079
  Message=There was an error generating the XML document.
  Source=System.Xml
  StackTrace:
       at System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces, String encodingStyle, String id)
       at System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter, Object o)
       at FormDemo.Form1.PivotGridSettings() in D:\Feature\XML Serialization\CS\Form1.cs:line 75
       at FormDemo.Form1..ctor() in D:\Feature\XML Serialization\CS\Form1.cs:line 32
       at FormDemo.Program.Main() in D:\Feature\XML Serialization\CS\Program.cs:line 25
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: System.InvalidOperationException
       HResult=-2146233079
       Message=System.RuntimeType is inaccessible due to its protection level. Only public types can be processed.
       Source=System.Xml
       StackTrace:
            at System.Xml.Serialization.TypeDesc.CheckSupported()
            at System.Xml.Serialization.TypeScope.GetTypeDesc(Type type, MemberInfo source, Boolean directReference, Boolean throwOnError)
            at System.Xml.Serialization.XmlSerializationWriter.CreateUnknownTypeException(Type type)
            at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriterCustomSerializer.Write20_Type(String n, String ns, Type o, Boolean isNullable, Boolean needType)
            at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriterCustomSerializer.Write24_CustomClass(String n, String ns, CustomEngine o, Boolean isNullable, Boolean needType)
            at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriterCustomSerializer.Write25_CustomClass(String n, String ns, CustomSeriaizer o, Boolean isNullable, Boolean needType)
            at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriterCustomSerializer.Write26_CustomSerializer(Object o)
       InnerException: 
</code></pre>

<p>My Serialization code is</p>

<pre><code>XmlTextWriter xw = new XmlTextWriter("CustomClassSchema.xml", System.Text.Encoding.UTF8);
xw.Formatting = Formatting.Indented;
XmlSerializer serializer = new XmlSerializer(typeof(CustomSerializer));
CustomSerializer customSerializer = new CustomSerializer()
serializer.Serialize(xw, customSerializer);
</code></pre>

<p>Please help me to resolve this issue. Is there any customization that i need to do with my custom class or any?</p>