Sitecore 8.2.3 preview error. Experience editor, ribbon error after upgrade

7.5 was converted to 8.2.3. Web site works on browser. But when I preview a page in content editor, I get this error on the page:

url of the page = sitecore/client/Applications/ExperienceEditor/Ribbon.aspx?sc_content=core&ribbonId=

[InvalidOperationException: Could not locate type 'Sitecore.Shell.Client.Speak.Layouts.Renderings.Resources.Pipelines.PipelineRenderingModel,Sitecore.Speak.Bootstrap3'. Model reference: 'Sitecore.Shell.Client.Speak.Layouts.Renderings.Resources.Pipelines.PipelineRenderingModel,Sitecore.Speak.Bootstrap3'] Sitecore.Mvc.Presentation.ModelLocator.GetModelFromTypeName(String typeName, String model, Boolean throwOnTypeCreationError) +244
Sitecore.Mvc.Pipelines.Response.GetModel.GetFromRenderingItem.Process(GetModelArgs args) +38 (Object , Object[] ) +74
Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args) +479
Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain) +22
Sitecore.Mvc.Pipelines.PipelineService.RunPipeline(String pipelineName, TArgs args) +195
Sitecore.Mvc.Pipelines.PipelineService.RunPipeline(String pipelineName, TArgs args, Func2 resultGetter) +161
Sitecore.Mvc.Presentation.Rendering.GetModel() +280
Sitecore.Mvc.Presentation.Rendering.get_Model() +30
Sitecore.Mvc.Extensions.ObjectExtensions.ValueOrDefault(T source, Func2 resultGetter) +57
Sitecore.Mvc.Presentation.ViewRenderer.get_Model() +150
Sitecore.Mvc.Presentation.ViewRenderer.Render(TextWriter writer) +221

[InvalidOperationException: Error while rendering view: '/sitecore/shell/client/Speak/Layouts/Renderings/Resources/Pipelines/Pipeline.cshtml'. ] Sitecore.Mvc.Presentation.ViewRenderer.Render(TextWriter writer) +792 Sitecore.Mvc.Pipelines.Response.RenderRendering.ExecuteRenderer.Render(Renderer renderer, TextWriter writer, RenderRenderingArgs args) +147
Sitecore.Mvc.Pipelines.Response.RenderRendering.ExecuteRenderer.Process(RenderRenderingArgs args) +75 (Object , Object[] ) +74
Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args) +479
Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain) +22
Sitecore.Mvc.Pipelines.PipelineService.RunPipeline(String pipelineName, TArgs args) +195
Sitecore.Mvc.Pipelines.Response.RenderPlaceholder.PerformRendering.Render(String placeholderName, TextWriter writer, RenderPlaceholderArgs args) +183
(Object , Object[] ) +74
Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args) +479
Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain) +22
Sitecore.Mvc.Pipelines.PipelineService.RunPipeline(String pipelineName, TArgs args) +195
Sitecore.Mvc.Helpers.SitecoreHelper.Placeholder(String placeholderName) +258
ASP._sitecore_shell_client_Speak_Layouts_Layouts_Speak_Layout_cshtml.Execute() +1681 System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +252 System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +148
System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +122
System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData) +136 Sitecore.Mvc.Presentation.ViewRenderer.Render(TextWriter writer) +309

[InvalidOperationException: Error while rendering view: '/sitecore/shell/client/Speak/Layouts/Layouts/Speak-Layout.cshtml' (model: 'Sitecore.Mvc.Presentation.RenderingModel, Sitecore.Mvc'). ]
Sitecore.Mvc.Presentation.ViewRenderer.Render(TextWriter writer) +792 Sitecore.Mvc.Pipelines.Response.RenderRendering.ExecuteRenderer.Render(Renderer renderer, TextWriter writer, RenderRenderingArgs args) +147
Sitecore.Mvc.Pipelines.Response.RenderRendering.ExecuteRenderer.Process(RenderRenderingArgs args) +75 (Object , Object[] ) +74
Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args) +479
Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain) +22
Sitecore.Mvc.Pipelines.PipelineService.RunPipeline(String pipelineName, TArgs args) +195
Sitecore.Mvc.Presentation.RenderingView.Render(ViewContext viewContext, TextWriter writer) +301
System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +375 System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +88
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +831
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +831
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList1 filters, ActionResult actionResult) +81
System.Web.Mvc.Async.<>c__DisplayClass21.b__1e(IAsyncResult asyncResult) +36

Sitecore.Speak.Bootstrap3 was the issue. In 7.5 the experience editor was customized with this SDK. And we forgot about it during upgrade. Upgrade went well but it did not change he customization of experience editor in Core DB. Hence this problem occured. We solved it with taking corresponding item (21E86498-6C8E-4F3B-83F2-B49E5E0ABE16) from the vanilla installation of 8.2.3 and installed the package upgraded sitecore.

we got the item (21E86498-6C8E-4F3B-83F2-B49E5E0ABE16) by searching for 'Sitecore.Speak.Bootstrap3' text in Core DB .