Thank you for asking about this.

We’re sorry to hear about the recent licensing message issue you reported. This is expected since you’re still using the perpetual commercial version of Hotcakes Commerce. Support for the commercial license engine ended approximately 6-months after Hotcakes Commerce transitioned from a commercial solution to being open source. That was nearly two years ago (or more) at this time. We apologize for any inconvenience that this has caused you now. ☹

You'll find references to the licensing engine announcements below. These links went out in several announcements to all of our contacts in the Hotcakes Commerce company channels over two years ago to keep everyone informed of this potential issue.

[url=https://mmmcommerce.com/Resources/Blog/PostId/511/hotcakes-commerce-is-now-an-open-source-ecommerce-cms]Hotcakes Commerce is now open source[/url]
[url=https://hotcakescommerce.zendesk.com/hc/en-us/articles/115002848686-Version-3-0-FAQ-s]Hotcakes Commerce version 3.0 FAQs[/url]

You can resolve this issue on your own by upgrading Hotcakes Commerce to the most recent version. As of right now, that would be version 03.02.01.

[list][*][url=https://mmmcommerce.com/Resources/Downloads]Download Hotcakes Commerce[/url]
[*][url=https://hotcakescommerce.zendesk.com/hc/en-us/articles/115002991466-Upgrading-Hotcakes-Commerce]How to upgrade Hotcakes Commerce[/url]
[*][url=https://hotcakescommerce.zendesk.com/hc/en-us/articles/209637973-What-to-do-When-Upgrading-Hotcakes]What to do when upgrading Hotcakes Commerce[/url]
[*][url=https://hotcakescommerce.zendesk.com/hc/en-us/sections/201049349-Release-Notes]Release notes for all versions of Hotcakes Commerce[/url][/list]

If you wish to have someone do the upgrade for you, we’d be happy to do that as well. The links below will help you learn more about our company and how we can help. 😊

[list][*][url=https://upendoventures.com/What/Hotcakes-Commerce]We maintain Hotcakes Commerce and are the official provider of commercial services[/url]
[*][url=https://upendoventures.com/What/CMS/DNN]We’re known worldwide as DNN experts[/url]
[*][url=https://upendoventures.com/Clients]See what our clients say about us[/url]
[*][url=https://upendoventures.com/How/People/Will-Strohl]Learn more about me[/url] (I know YOU know me, but that link is for the benefit of others that may come across this forum post) :)[/list]

If you'd simply like to have support for Hotcakes Commerce in the future, please use the community forums or purchase a support contract. We hope to provide support to you in an official capacity very soon and for years to come.

[list][*]Hotcakes Commerce Free Community Forums (you're here already)
[*][url=https://upendoventures.com/Shop/Product/slug/Hotcakes-Commerce-On-Premise-SLA]Hotcakes Commerce On-Premise Support, SLA-Backed[/url]
[*][url=https://upendoventures.com/Shop/Product/slug/Hotcakes-Commerce-Developer-Support]Hotcakes Commerce Developer Support Services, SLA-Backed[/url][/list]

If you'd like to discuss the options prior to purchase, please feel free to book a meeting with us using the link below.

[list][*][url=https://upendoventures.com/Schedule-Us]Schedule a Meeting with Us[/url][/list]

Again, we apologize for any inconvenience you’ve experienced due to this issue. If possible, we hope to support you in a more formal capacity in the future.

Thank you in advance for your time and understanding. I hope you find this to have been helpful. Please have a wonderful rest of your day! 😊

Thanks Will

we tried to upgrade both using the upgrade package and restarting the install package.
In both cases for all the modules on the page we get the following error, while the administration part of HotCakes works correctly.
What do we have to do ?
Thanks as always for the availability ... and if it happens in Italy make a whistle :)
Best
Claudio

Errore: Hotcakes Product Grid non è attualmente disponibile. DotNetNuke.Services.Exceptions.ModuleLoadException: Error executing child request for handler 'System.Web.Mvc.HttpHandlerUtil+ServerExecuteHttpHandlerAsyncWrapper'. ---> System.Web.HttpException: Error executing child request for handler 'System.Web.Mvc.HttpHandlerUtil+ServerExecuteHttpHandlerAsyncWrapper'. ---> System.ArgumentException: Expression of type 'System.Web.Mvc.MvcWebRazorHostFactory' cannot be used for return type 'System.Web.WebPages.Razor.WebRazorHostFactory' at System.Linq.Expressions.Expression.ValidateLambdaArgs(Type delegateType, Expression& body, ReadOnlyCollection`1 parameters) at System.Linq.Expressions.Expression.Lambda[TDelegate](Expression body, String name, Boolean tailCall, IEnumerable`1 parameters) at System.Web.WebPages.Razor.WebRazorHostFactory.CreateFactory(String typeName) at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory) at System.Web.WebPages.Razor.WebRazorHostFactory.CreateHostFromConfigCore(RazorWebSectionGroup config, String virtualPath, String physicalPath) at System.Web.WebPages.Razor.WebRazorHostFactory.CreateHostFromConfig(String virtualPath, String physicalPath) at System.Web.WebPages.Razor.RazorBuildProvider.GetHostFromConfig() at System.Web.WebPages.Razor.RazorBuildProvider.CreateHost() at System.Web.WebPages.Razor.RazorBuildProvider.EnsureGeneratedCode() at System.Web.WebPages.Razor.RazorBuildProvider.get_CodeCompilerType() at System.Web.Compilation.BuildProvider.GetCompilerTypeFromBuildProvider(BuildProvider buildProvider) at System.Web.Compilation.BuildProvidersCompiler.ProcessBuildProviders() at System.Web.Compilation.BuildProvidersCompiler.PerformBuild() at System.Web.Compilation.BuildManager.CompileWebFile(VirtualPath virtualPath) at System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate) at System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate) at System.Web.Compilation.BuildManager.GetVirtualPathObjectFactory(VirtualPath virtualPath, HttpContext context, Boolean allowCrossApp, Boolean throwIfNotFound) at System.Web.Compilation.BuildManager.GetCompiledType(VirtualPath virtualPath) at System.Web.Compilation.BuildManager.GetCompiledType(String virtualPath) at System.Web.Mvc.BuildManagerWrapper.System.Web.Mvc.IBuildManager.GetCompiledType(String virtualPath) at System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) at System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) at System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) at System.Web.Mvc.Async.AsyncControllerActionInvoker.c__DisplayClass21.c__DisplayClass2b.b__1c() at System.Web.Mvc.Async.AsyncControllerActionInvoker.c__DisplayClass21.b__1e(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.End() at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) at System.Web.Mvc.Controller.b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.End() at System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) at System.Web.Mvc.Controller.b__15(IAsyncResult asyncResult, Controller controller) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.End() at System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) at System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) at System.Web.Mvc.MvcHandler.b__5(IAsyncResult asyncResult, ProcessRequestState innerState) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.End() at System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) at System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) at System.Web.Mvc.HttpHandlerUtil.ServerExecuteHttpHandlerAsyncWrapper.c__DisplayClassa.b__9() at System.Web.Mvc.HttpHandlerUtil.ServerExecuteHttpHandlerWrapper.c__DisplayClass4.b__3() at System.Web.Mvc.HttpHandlerUtil.ServerExecuteHttpHandlerWrapper.Wrap[TResult](Func`1 func) at System.Web.Mvc.HttpHandlerUtil.ServerExecuteHttpHandlerWrapper.Wrap(Action action) at System.Web.Mvc.HttpHandlerUtil.ServerExecuteHttpHandlerAsyncWrapper.EndProcessRequest(IAsyncResult result) at System.Web.HttpServerUtility.ExecuteInternal(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage, VirtualPath path, VirtualPath filePath, String physPath, Exception error, String queryStringOverride) --- End of inner exception stack trace --- 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(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage) at System.Web.HttpServerUtility.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm) at System.Web.HttpServerUtilityWrapper.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm) at System.Web.Mvc.Html.ChildActionExtensions.ActionHelper(HtmlHelper htmlHelper, String actionName, String controllerName, RouteValueDictionary routeValues, TextWriter textWriter) at System.Web.Mvc.Html.ChildActionExtensions.Action(HtmlHelper htmlHelper, String actionName, String controllerName, RouteValueDictionary routeValues) at Hotcakes.Commerce.Dnn.Mvc.MvcRenderingEngine.Render(String controllerName, String actionName, String viewName, Object routeValues) at Hotcakes.Modules.ProductGrid.ProductGridView.RenderView() at Hotcakes.Commerce.Dnn.Web.HotcakesModuleBase.OnLoad(EventArgs e) --- End of inner exception stack trace ---

The error you posted is somewhat generic. This either has to do with the version of MVC or updates that have yet to be made to your custom viewset. Please refer to the upgrade guidance links in my previous post.