I'm developing a website using Umbraco, and getting the following error frequently in the logs. Everything appears to be working OK, so I just want to know... should I be worried about this?

2014-03-04 14:05:26,099 [66] ERROR Umbraco.Core.PluginManager - [Thread 104] Error creating type Umbraco.Core.Models.PublishedContent.PublishedPropertyType+CompatConverter
System.MissingMethodException: No parameterless constructor defined for this object.
   at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck)
   at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark)
   at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark)
   at System.Activator.CreateInstance(Type type, Boolean nonPublic)
   at System.Activator.CreateInstance(Type type)
   at Umbraco.Core.PluginManager.CreateInstances[T](IEnumerable`1 types, Boolean throwException)