I get the following error while trying to access the Host/Schedule after upgrading to 4.8.4 from 4.0.2. Any insite as how to fix this?

Error: Schedule is currently unavailable.
DotNetNuke.Services.Exceptions.ModuleLoadException: The type initializer for 'DotNetNuke.Services.Scheduling.DNNScheduling.DataProvider' threw an exception. ---> System.TypeInitializationException: The type initializer for 'DotNetNuke.Services.Scheduling.DNNScheduling.DataProvider' threw an exception. ---> System.ArgumentNullException: Value cannot be null. Parameter name: type at System.Activator.CreateInstance(Type type, Boolean nonPublic) at DotNetNuke.Framework.Reflection.CreateObject(String ObjectProviderType, String ObjectProviderName, String ObjectNamespace, String ObjectAssemblyName, Boolean UseCache) at DotNetNuke.Framework.Reflection.CreateObject(String ObjectProviderType, String ObjectNamespace, String ObjectAssemblyName) at DotNetNuke.Services.Scheduling.DNNScheduling.DataProvider.CreateProvider() at DotNetNuke.Services.Scheduling.DNNScheduling.DataProvider..cctor() --- End of inner exception stack trace --- at DotNetNuke.Services.Scheduling.DNNScheduling.SchedulingController.GetSchedule() at DotNetNuke.Services.Scheduling.DNNScheduling.DNNScheduler.GetSchedule() at DotNetNuke.Modules.Admin.Scheduling.ViewSchedule.Page_Load(Object sender, EventArgs e) --- End of inner exception stack trace ---

If you look at this posting...William Severance covers the issue with how DLLs are handled in later versions of DNN.

http://www.dotnetnuke.com/Community/Forums/tabid/795/forumid/107/threadid/193052/scope/posts/threadpage/1/Default.aspx

When I deleted the DotNetNuke.DNNScheduler.SqlDataProvider.dll (which is an old version of the DLL) from the bin folder the Host/Schedule now works. I also noticed that the Admin/Log Viewer wasn't working either. Also, deleting DotNetNuke.Provider.DBLoggingProvider.SqlDataProvider.dll fixed this issue.