Error while saving bot state to azure blob storage

Hi i am trying to save bot framework using C#, I am trying to save bot state to azure blob storageusing nuget package Microsoft.Bot.Builder.Azure.Blobs version 4.19.2.What i am doing is in Startup.cs file is

var storage = new BlobsStorage("connectionstring","containername");

var userState = new UserState(storage);services.AddSingleton(userState);

var conversationState = new ConversationState(storage);services.AddSingleton(conversationState);

But i am getting following error

System.InvalidOperationException: Unable to find the following types in the 'AllowedTypes' collection.

Please provide the 'AllowedTypesSerializationBinder' in the custom 'JsonSerializerSettings' instance, with the list of types to allow.

Example:new JsonSerializerSettings{SerializationBinder = new AllowedTypesSerializationBinder(new List{typeof(PromptOptions),typeof(DialogInstance),typeof(DialogState),}),}

When i check container blob files are generated anyways

I tried using nuget package Microsoft.Bot.Builder.Azure.Blobs version 4.19.2 to save bot state to azure blob storage account.