Upgrading from sitecore 6.6.0 (rev. 130529) to 7 and all worked fine until I tried to access 'Content Editor'. I get this strange error and have no idea what need to be done.
Exception: System.Web.HttpUnhandledException
Message: Exception of type 'System.Web.HttpUnhandledException' was thrown.
Source: System.Web
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.sitecore_shell_applications_content_manager_default_aspx.ProcessRequest(HttpContext context) in c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\953a4a3d\d5c79dc4\App_Web_l41k3wf4.2.cs:line 0
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
Nested Exception
Exception: System.Reflection.TargetInvocationException
Message: Exception has been thrown by the target of an invocation.
Source: mscorlib
at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at Sitecore.Reflection.ReflectionUtil.CallMethod(Type type, Object obj, String methodName, Boolean includeNonPublic, Boolean includeInherited, Boolean includeStatic, Object[] parameters)
at Sitecore.Shell.Applications.ContentManager.ContentEditorPage.OnPreRender(EventArgs e)
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
Nested Exception
Exception: System.TypeLoadException
Message: Access is denied: 'Sitecore.Shell.Applications.ContentEditor.RenderingDatasource'.
Source: mscorlib
at System.Reflection.RuntimeAssembly.GetType(RuntimeAssembly assembly, String name, Boolean throwOnError, Boolean ignoreCase, ObjectHandleOnStack type)
at System.Reflection.RuntimeAssembly.GetType(String name, Boolean throwOnError, Boolean ignoreCase)
at Sitecore.Web.UI.XmlControls.ControlSource.ResolveType(String controlName, Assembly assembly)
at Sitecore.Web.UI.XmlControls.AssemblyControlSource.ResolveType(String controlName, Boolean includeDynamicTypes)
at Sitecore.Web.UI.XmlControls.ControlSource.GetControlType(String namespacePrefix, String controlName, String mode, Boolean includeDynamicTypes)
at Sitecore.Web.UI.XmlControls.ControlFactory.GetControlType(String controlName, String mode, Boolean includeDynamicTypes)
at Sitecore.Web.UI.XmlControls.ControlFactory.GetControl(Control parent, String controlName, String mode, Object[] properties, AllowGenericControl allowGeneric)
at Sitecore.Shell.Applications.ContentEditor.EditorFormatter.GetEditor(Item fieldType)
at Sitecore.Shell.Applications.ContentEditor.EditorFormatter.RenderField(Control parent, Field field, Item fieldType, Boolean readOnly, String value)
at Sitecore.Shell.Applications.ContentEditor.EditorFormatter.RenderField(Control parent, Field field, Item fieldType, Boolean readOnly)
at Sitecore.Shell.Applications.ContentEditor.EditorFormatter.RenderField(Control parent, Field field, Boolean readOnly)
at Sitecore.Shell.Applications.ContentEditor.EditorFormatter.RenderSection(Section section, Control parent, Boolean readOnly)
at Sitecore.Shell.Applications.ContentEditor.EditorFormatter.RenderSections(Control parent, Sections sections, Boolean readOnly)
at Sitecore.Shell.Applications.ContentEditor.Pipelines.RenderContentEditor.RenderStandardContentEditor.Process(RenderContentEditorArgs args)
at (Object , Object[] )
at Sitecore.Pipelines.PipelineMethod.Invoke(Object[] parameters)
at Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args)
at Sitecore.Pipelines.CorePipeline.Run(String pipelineName, PipelineArgs args, String pipelineDomain, Boolean failIfNotExists)
at Sitecore.Pipelines.CorePipeline.Run(String pipelineName, PipelineArgs args, String pipelineDomain)
at Sitecore.Pipelines.CorePipeline.Run(String pipelineName, PipelineArgs args)
at Sitecore.Shell.Applications.ContentManager.Editor.Render(RenderContentEditorArgs args, Control parent)
at Sitecore.Shell.Applications.ContentManager.Editor.Render(Item item, Item root, Hashtable fieldInfo, Control parent, Boolean showEditor)
at Sitecore.Shell.Applications.ContentManager.ContentEditorForm.RenderEditor(Item item, Item root, Control parent, Boolean showEditor)
at Sitecore.Shell.Applications.ContentManager.ContentEditorForm.UpdateEditor(Item folder, Item root, Boolean showEditor)
at Sitecore.Shell.Applications.ContentManager.ContentEditorForm.Update()
at Sitecore.Shell.Applications.ContentManager.ContentEditorForm.OnPreRendered(EventArgs e)
Tried few times but I cannot see this going away. Anyone else had this before?
Updated with full stack now. I'm not sure if first 2 exceptions has anything to do with this but it might be part of the problem.
The error is from Sitecore trying to load an assembly via reflection and getting a system level access denied on the DLL. You should check that the identity your AppPool runs as has access to the webroot, in particular, the /bin folder and all it's contents.