Un-handled error in Global.asax Application ONERROR.

Error executing child request for /inigo/w3a_dyn/defaultErrorPage.aspx.
System.Web.HttpException (0x80004005): Error executing child request for /inigo/w3a_dyn/defaultErrorPage.aspx. ---> System.TypeLoadException: Could not load type 'XenoCode.User.Attributes.AssemblyAttributes.SuppressDisassembly' from assembly 'obout_ASPTreeView_2_NET, Version=2.0.16.0, Culture=neutral, PublicKeyToken=d2c6651e4287bdb2' because the parent does not exist.
   at System.ModuleHandle.ResolveType(RuntimeModule module, Int32 typeToken, IntPtr* typeInstArgs, Int32 typeInstCount, IntPtr* methodInstArgs, Int32 methodInstCount, ObjectHandleOnStack type)
   at System.ModuleHandle.ResolveTypeHandleInternal(RuntimeModule module, Int32 typeToken, RuntimeTypeHandle[] typeInstantiationContext, RuntimeTypeHandle[] methodInstantiationContext)
   at System.Reflection.RuntimeModule.ResolveType(Int32 metadataToken, Type[] genericTypeArguments, Type[] genericMethodArguments)
   at System.Reflection.CustomAttribute.FilterCustomAttributeRecord(CustomAttributeRecord caRecord, MetadataImport scope, Assembly& lastAptcaOkAssembly, RuntimeModule decoratedModule, MetadataToken decoratedToken, RuntimeType attributeFilterType, Boolean mustBeInheritable, Object[] attributes, IList derivedAttributes, RuntimeType& attributeType, IRuntimeMethodInfo& ctor, Boolean& ctorHasParameters, Boolean& isVarArg)
   at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType, Boolean mustBeInheritable, IList derivedAttributes, Boolean isDecoratedTargetSecurityTransparent)
   at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeAssembly assembly, RuntimeType caType)
   at System.Reflection.RuntimeAssembly.GetCustomAttributes(Boolean inherit)
   at System.Web.UI.AssemblyCache.GetAjaxFrameworkAssemblyAttribute(Assembly assembly)
   at System.Web.UI.ScriptManager.get_DefaultAjaxFrameworkAssembly()
   at System.Web.UI.ScriptManager..ctor()
   at Telerik.Web.UI.RadScriptManager..ctor()
   at ASP.inigo_w3a_dyn_defaulterrorpage_aspx.__BuildControlscrMan() in d:\INetPub\thewebarchitects.com\sites\Inigo2011\Inigo\w3a_dyn\defaulterrorpage.aspx:line 88
   at ASP.inigo_w3a_dyn_defaulterrorpage_aspx.__BuildControldefaultErrorPage() in d:\INetPub\thewebarchitects.com\sites\Inigo2011\Inigo\w3a_dyn\defaulterrorpage.aspx:line 87
   at ASP.inigo_w3a_dyn_defaulterrorpage_aspx.__BuildControlTree(inigo_w3a_dyn_defaulterrorpage_aspx __ctrl) in d:\INetPub\thewebarchitects.com\sites\Inigo2011\Inigo\w3a_dyn\defaulterrorpage.aspx:line 1
   at ASP.inigo_w3a_dyn_defaulterrorpage_aspx.FrameworkInitialize() in c:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\18da533a\dd483c9d\App_Web_defaulterrorpage.aspx.eecf9dca.cukcm5si.0.cs:line 0
   at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest()
   at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context)
   at System.Web.UI.Page.ProcessRequest(HttpContext context)
   at ASP.inigo_w3a_dyn_defaulterrorpage_aspx.ProcessRequest(HttpContext context) in c:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\18da533a\dd483c9d\App_Web_defaulterrorpage.aspx.eecf9dca.cukcm5si.0.cs:line 0
   at System.Web.HttpServerUtility.ExecuteInternal(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage, VirtualPath path, VirtualPath filePath, String physPath, Exception error, String queryStringOverride)
   at System.Web.HttpServerUtility.ExecuteInternal(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage, VirtualPath path, VirtualPath filePath, String physPath, Exception error, String queryStringOverride)
   at System.Web.HttpServerUtility.Execute(String path, TextWriter writer, Boolean preserveForm)
   at System.Web.HttpServerUtility.Transfer(String path, Boolean preserveForm)
   at w3a.Inigo.Global.Application_Error(Object sender, EventArgs e) in F:\My Dropbox\3internet\Projects\InigoV2\InigoV2_code\Inigo\Global.asax.cs:line 156

Original error was.
Exception of type 'System.Web.HttpUnhandledException' was thrown.
System.Web.HttpUnhandledException (0x80004005): Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.TypeLoadException: Could not load type 'XenoCode.User.Attributes.AssemblyAttributes.SuppressDisassembly' from assembly 'obout_ASPTreeView_2_NET, Version=2.0.16.0, Culture=neutral, PublicKeyToken=d2c6651e4287bdb2' because the parent does not exist.
   at System.ModuleHandle.ResolveType(RuntimeModule module, Int32 typeToken, IntPtr* typeInstArgs, Int32 typeInstCount, IntPtr* methodInstArgs, Int32 methodInstCount, ObjectHandleOnStack type)
   at System.ModuleHandle.ResolveTypeHandleInternal(RuntimeModule module, Int32 typeToken, RuntimeTypeHandle[] typeInstantiationContext, RuntimeTypeHandle[] methodInstantiationContext)
   at System.Reflection.RuntimeModule.ResolveType(Int32 metadataToken, Type[] genericTypeArguments, Type[] genericMethodArguments)
   at System.Reflection.CustomAttribute.FilterCustomAttributeRecord(CustomAttributeRecord caRecord, MetadataImport scope, Assembly& lastAptcaOkAssembly, RuntimeModule decoratedModule, MetadataToken decoratedToken, RuntimeType attributeFilterType, Boolean mustBeInheritable, Object[] attributes, IList derivedAttributes, RuntimeType& attributeType, IRuntimeMethodInfo& ctor, Boolean& ctorHasParameters, Boolean& isVarArg)
   at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType, Boolean mustBeInheritable, IList derivedAttributes, Boolean isDecoratedTargetSecurityTransparent)
   at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeAssembly assembly, RuntimeType caType)
   at System.Reflection.RuntimeAssembly.GetCustomAttributes(Boolean inherit)
   at System.Web.UI.AssemblyCache.GetAjaxFrameworkAssemblyAttribute(Assembly assembly)
   at System.Web.UI.ScriptManager.get_DefaultAjaxFrameworkAssembly()
   at System.Web.UI.ScriptManager..ctor()
   at Telerik.Web.UI.RadScriptManager..ctor()
   at w3a.Inigo.BasePage.OnPreInit(EventArgs e) in F:\My Dropbox\3internet\Projects\InigoV2\InigoV2_code\Inigo\BasePage.cs:line 577
   at System.Web.UI.Page.PerformPreInit()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.HandleError(Exception e)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest()
   at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context)
   at System.Web.UI.Page.ProcessRequest(HttpContext context)
   at ASP.templates_profiles_new_aspx.ProcessRequest(HttpContext context)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
ERROR inner EXC:
Could not load type 'XenoCode.User.Attributes.AssemblyAttributes.SuppressDisassembly' from assembly 'obout_ASPTreeView_2_NET, Version=2.0.16.0, Culture=neutral, PublicKeyToken=d2c6651e4287bdb2' because the parent does not exist.

System.TypeLoadException: Could not load type 'XenoCode.User.Attributes.AssemblyAttributes.SuppressDisassembly' from assembly 'obout_ASPTreeView_2_NET, Version=2.0.16.0, Culture=neutral, PublicKeyToken=d2c6651e4287bdb2' because the parent does not exist.
   at System.ModuleHandle.ResolveType(RuntimeModule module, Int32 typeToken, IntPtr* typeInstArgs, Int32 typeInstCount, IntPtr* methodInstArgs, Int32 methodInstCount, ObjectHandleOnStack type)
   at System.ModuleHandle.ResolveTypeHandleInternal(RuntimeModule module, Int32 typeToken, RuntimeTypeHandle[] typeInstantiationContext, RuntimeTypeHandle[] methodInstantiationContext)
   at System.Reflection.RuntimeModule.ResolveType(Int32 metadataToken, Type[] genericTypeArguments, Type[] genericMethodArguments)
   at System.Reflection.CustomAttribute.FilterCustomAttributeRecord(CustomAttributeRecord caRecord, MetadataImport scope, Assembly& lastAptcaOkAssembly, RuntimeModule decoratedModule, MetadataToken decoratedToken, RuntimeType attributeFilterType, Boolean mustBeInheritable, Object[] attributes, IList derivedAttributes, RuntimeType& attributeType, IRuntimeMethodInfo& ctor, Boolean& ctorHasParameters, Boolean& isVarArg)
   at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType, Boolean mustBeInheritable, IList derivedAttributes, Boolean isDecoratedTargetSecurityTransparent)
   at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeAssembly assembly, RuntimeType caType)
   at System.Reflection.RuntimeAssembly.GetCustomAttributes(Boolean inherit)
   at System.Web.UI.AssemblyCache.GetAjaxFrameworkAssemblyAttribute(Assembly assembly)
   at System.Web.UI.ScriptManager.get_DefaultAjaxFrameworkAssembly()
   at System.Web.UI.ScriptManager..ctor()
   at Telerik.Web.UI.RadScriptManager..ctor()
   at w3a.Inigo.BasePage.OnPreInit(EventArgs e) in F:\My Dropbox\3internet\Projects\InigoV2\InigoV2_code\Inigo\BasePage.cs:line 577
   at System.Web.UI.Page.PerformPreInit()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)