I just upgrade to the latest version.  When I Log in as "Host" and go to "Schedule"  I get the following error.  Any advice or suggestions?  I have already truncated the schedule history table.

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 ---

I have not actively downloaded any new data providers so I assume that I am using the default one.  Is there a DLL or file that I should search for to see if it is the default provider?

Also...what should I look for in the web.config?

Assuming that nothing has changed, the section I am referring to should look like this (it is near the bottom):

<scheduling defaultProvider="DNNScheduler">
      <providers>
        <clear />
        <add name="DNNScheduler" type="DotNetNuke.Services.Scheduling.DNNScheduling.DNNScheduler, DotNetNuke.DNNScheduler" providerPath="~\Providers\SchedulingProviders\DNNScheduler\" debug="false" maxThreads="1" />
      </providers>
    </scheduling>

It should match that exactly.  Just as a hunch, I would also suggest putting a line break somewhere in your Web.Config and saving it.  See if  you can see it then.  (That is just in case there is a cache issue.) 

The other (hopefully) last thing to try would be to grab the DLL from the Install package for your version of DNN and overwriting the one in your Bin folder.  The assembly name is "DotNetNuke.DNNScheduler.dll".