Can anyone give me some insight as to where to begin looking to resolve this error?  It happens several times a minute on one of my DNN portals. 

I can tell that it is referring to reflection and the creation of an object, but unfortunately, I do not see where to proceed to begin taking care of this exception.

AssemblyVersion: -1
PortalID: -1
PortalName:
UserID: -1
UserName:
ActiveTabID: -1
ActiveTabName:
RawURL:
AbsoluteURL:
AbsoluteURLReferrer:
UserAgent:
DefaultDataProvider:
ExceptionGUID:
InnerException: Could not load type ''.
FileName:
FileLineNumber: -1
FileColumnNumber: -1
Method:
StackTrace:
Message: System.Web.HttpException: Could not load type ''. ---> System.ArgumentException: String cannot have zero length. at System.Reflection.Assembly.GetType(String name, Boolean throwOnError, Boolean ignoreCase) at System.Web.Compilation.BuildManager.GetType(String typeName, Boolean throwOnError, Boolean ignoreCase) --- End of inner exception stack trace --- at System.Web.Compilation.BuildManager.GetType(String typeName, Boolean throwOnError, Boolean ignoreCase) at DotNetNuke.Framework.Reflection.CreateType(String TypeName, String CacheKey, Boolean UseCache, Boolean IgnoreErrors)
Source:
Server Name: [A SERVER NAME WAS HERE]

ModuleDefinitions does not have a SupportedFeatures column.

Interesting.  I have run this query for all of my modules.  However, just in case a couple of my 3rd party modules (and the Repository Module) really need that setting.  That is, until I know what it does.  Thanks for your help! 

You're all over the forums and blogs.  Where do you find the time?  :)