BlockType.ModelType must correspond to a type inheriting EPiServer.Core.BlockData

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hi 

our epi 8 started throwing error on the production servers, any ideas  ?

[Thread-0] ERROR EPiServer.Framework.Initialization.InitializationEngine: Initialize action failed for Initialize on class EPiServer.Initialization.ModelSyncInitialization, EPiServer, Version=8.0.0.0, Culture=neutral, PublicKeyToken=8fe83dea738b45b7
System.NotSupportedException: BlockType.ModelType must correspond to a type inheriting EPiServer.Core.BlockData
   at EPiServer.DataAbstraction.DefaultContentTypeRepository.ValidateModelType(ContentType contentType)
   at EPiServer.DataAbstraction.DefaultContentTypeRepository.Save(ContentType contentType)
   at EPiServer.DataAbstraction.RuntimeModel.ContentTypeSynchronizer.UpdateType(ContentTypeModel model)
   at EPiServer.DataAbstraction.RuntimeModel.ContentTypeModelRegister.CommitTypes(Boolean deleteUnusedTypes)
   at EPiServer.DataAbstraction.RuntimeModel.ContentTypeModelScanner.Sync(Boolean commitChanges)
   at EPiServer.Initialization.ModelSyncInitialization.Initialize(InitializationEngine context)
   at EPiServer.Framework.Initialization.ModuleNode.Execute(Action a, String key)
   at EPiServer.Framework.Initialization.InitializationEngine.InitializeModules()
 
#179374
Jun 09, 2017 9:29
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