TypeMismatchException

This error showed up on a production (not yet live) server.

It's troubling because the build was showing no issues for a week prior but there has been an extensive content entry on the Catalog and CMS side. 

[TypeMismatchException: The backing type 'EPiServer.Core.PropertyDate' is not a registered PropertyDefinitionType]
   EPiServer.DataAbstraction.RuntimeModel.Internal.PropertyDefinitionSynchronizer.ResolveType(PropertyDefinitionModel model) +341
   EPiServer.DataAbstraction.RuntimeModel.Internal.ContentTypeModelRegister.ValidateChangeOfModelType(PropertyDefinitionModel propertyModel, String modelName) +66
   EPiServer.DataAbstraction.RuntimeModel.Internal.ContentTypeModelRegister.SetStateForPropertyDefinitionModels(ContentTypeModel model) +137
   EPiServer.DataAbstraction.RuntimeModel.Internal.ContentTypeModelRegister.<AnalyzeProperties>b__14_0(ContentTypeModel model) +59
   System.Threading.Tasks.<>c__DisplayClass31_0`2.<ForEachWorker>b__0(Int32 i) +63
   System.Threading.Tasks.<>c__DisplayClass17_0`1.<ForWorker>b__1() +928
   System.Threading.Tasks.Task.InnerInvoke() +39
   System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask) +18
   System.Threading.Tasks.<>c__DisplayClass176_0.<ExecuteSelfReplicating>b__0(Object ) +199

It appears it could be something related to the data entry that is creating corrupted data and resulting issue. I say this because I’ve ran an old release against the production dbs and get the same issue in my local environment.

If anyone has had experience with this or solved an issue like this your comments are greatly appreciated.

Thanks,

Ben