System.ArgumentException: GenericArguments[0], 'Microsoft.FSharp.Core.ExtraTopLevelOperators+CreateDictionary@45[System.String,System.DateTime]', on 'MongoDB.Bson.Serialization.Serializers.DictionaryInterfaceImplementerSerializer`3[TDictionary,TKey,TValue]' violates the constraint of type 'TDictionary'. ---> System.TypeLoadException: GenericArguments[0], 'Microsoft.FSharp.Core.ExtraTopLevelOperators+CreateDictionary@45[System.String,System.DateTime]', on 'MongoDB.Bson.Serialization.Serializers.DictionaryInterfaceImplementerSerializer`3[TDictionary,TKey,TValue]' violates the constraint of type parameter 'TDictionary'.
   at System.RuntimeTypeHandle.Instantiate(RuntimeTypeHandle handle, IntPtr* pInst, Int32 numGenericArgs, ObjectHandleOnStack type)
   at System.RuntimeTypeHandle.Instantiate(Type[] inst)
   at System.RuntimeType.MakeGenericType(Type[] instantiation)
   --- End of inner exception stack trace ---
   at System.RuntimeType.ValidateGenericArguments(MemberInfo definition, RuntimeType[] genericArguments, Exception e)
   at System.RuntimeType.MakeGenericType(Type[] instantiation)
   at MongoDB.Bson.Serialization.BsonSerializationProviderBase.CreateGenericSerializer(Type serializerTypeDefinition, Type[] typeArguments, IBsonSerializerRegistry serializerRegistry)
   at MongoDB.Bson.Serialization.CollectionsSerializationProvider.GetCollectionSerializer(Type type, IBsonSerializerRegistry serializerRegistry)
   at MongoDB.Bson.Serialization.CollectionsSerializationProvider.GetSerializer(Type type, IBsonSerializerRegistry serializerRegistry)
   at MongoDB.Bson.Serialization.BsonSerializerRegistry.CreateSerializer(Type type)
   at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
   at MongoDB.Bson.Serialization.BsonSerializerRegistry.GetSerializer(Type type)
   at MongoDB.Bson.Serialization.Serializers.ImpliedImplementationInterfaceSerializer`2.Serialize(BsonSerializationContext context, BsonSerializationArgs args, TInterface value)
   at MongoDB.Bson.Serialization.Serializers.SerializerBase`1.MongoDB.Bson.Serialization.IBsonSerializer.Serialize(BsonSerializationContext context, BsonSerializationArgs args, Object value)
   at MongoDB.Bson.Serialization.IBsonSerializerExtensions.Serialize(IBsonSerializer serializer, BsonSerializationContext context, Object value)
   at MongoDB.Bson.Serialization.BsonClassMapSerializer`1.SerializeClass(BsonSerializationContext context, BsonSerializationArgs args, TClass document)
   at MongoDB.Bson.Serialization.BsonClassMapSerializer`1.Serialize(BsonSerializationContext context, BsonSerializationArgs args, TClass value)
   at MongoDB.Bson.Serialization.Serializers.SerializerBase`1.MongoDB.Bson.Serialization.IBsonSerializer.Serialize(BsonSerializationContext context, BsonSerializationArgs args, Object value)
   at MongoDB.Bson.Serialization.IBsonSerializerExtensions.Serialize(IBsonSerializer serializer, BsonSerializationContext context, Object value)
   at MongoDB.Bson.Serialization.BsonClassMapSerializer`1.SerializeClass(BsonSerializationContext context, BsonSerializationArgs args, TClass document)
   at MongoDB.Bson.Serialization.BsonClassMapSerializer`1.Serialize(BsonSerializationContext context, BsonSerializationArgs args, TClass value)
   at MongoDB.Bson.Serialization.Serializers.SerializerBase`1.MongoDB.Bson.Serialization.IBsonSerializer.Serialize(BsonSerializationContext context, BsonSerializationArgs args, Object value)
   at MongoDB.Bson.Serialization.IBsonSerializerExtensions.Serialize(IBsonSerializer serializer, BsonSerializationContext context, Object value)
   at MongoDB.Bson.Serialization.BsonClassMapSerializer`1.SerializeClass(BsonSerializationContext context, BsonSerializationArgs args, TClass document)
   at MongoDB.Bson.Serialization.BsonClassMapSerializer`1.Serialize(BsonSerializationContext context, BsonSerializationArgs args, TClass value)
   at MongoDB.Bson.Serialization.Serializers.SerializerBase`1.MongoDB.Bson.Serialization.IBsonSerializer.Serialize(BsonSerializationContext context, BsonSerializationArgs args, Object value)
   at MongoDB.Bson.Serialization.IBsonSerializerExtensions.Serialize(IBsonSerializer serializer, BsonSerializationContext context, Object value)
   at MongoDB.Bson.Serialization.Serializers.BsonValueSerializerBase`1.Serialize(BsonSerializationContext context, BsonSerializationArgs args, TBsonValue value)
   at MongoDB.Bson.Serialization.Serializers.SerializerBase`1.MongoDB.Bson.Serialization.IBsonSerializer.Serialize(BsonSerializationContext context, BsonSerializationArgs args, Object value)
   at MongoDB.Bson.Serialization.IBsonSerializerExtensions.Serialize(IBsonSerializer serializer, BsonSerializationContext context, Object value)
   at MongoDB.Driver.Core.Operations.BulkInsertOperation.InsertBatchSerializer.SerializeRequest(BsonSerializationContext context, WriteRequest request)
   at MongoDB.Driver.Core.Operations.BulkUnmixedWriteOperationBase.BatchSerializer.AddRequest(BsonSerializationContext context, WriteRequest request)
   at MongoDB.Driver.Core.Operations.BulkUnmixedWriteOperationBase.BatchSerializer.SerializeNextBatch(BsonSerializationContext context, BatchableSource`1 requestSource)
   at MongoDB.Bson.Serialization.Serializers.SerializerBase`1.MongoDB.Bson.Serialization.IBsonSerializer.Serialize(BsonSerializationContext context, BsonSerializationArgs args, Object value)
   at MongoDB.Bson.Serialization.IBsonSerializerExtensions.Serialize(IBsonSerializer serializer, BsonSerializationContext context, Object value)
   at MongoDB.Bson.Serialization.Serializers.BsonValueSerializerBase`1.Serialize(BsonSerializationContext context, BsonSerializationArgs args, TBsonValue value)
   at MongoDB.Bson.Serialization.Serializers.SerializerBase`1.MongoDB.Bson.Serialization.IBsonSerializer.Serialize(BsonSerializationContext context, BsonSerializationArgs args, Object value)
   at MongoDB.Bson.Serialization.IBsonSerializerExtensions.Serialize(IBsonSerializer serializer, BsonSerializationContext context, Object value)
   at MongoDB.Bson.Serialization.Serializers.BsonValueSerializerBase`1.Serialize(BsonSerializationContext context, BsonSerializationArgs args, TBsonValue value)
   at MongoDB.Bson.Serialization.Serializers.BsonArraySerializer.SerializeValue(BsonSerializationContext context, BsonSerializationArgs args, BsonArray value)
   at MongoDB.Bson.Serialization.Serializers.BsonValueSerializerBase`1.Serialize(BsonSerializationContext context, BsonSerializationArgs args, TBsonValue value)
   at MongoDB.Bson.Serialization.Serializers.SerializerBase`1.MongoDB.Bson.Serialization.IBsonSerializer.Serialize(BsonSerializationContext context, BsonSerializationArgs args, Object value)
   at MongoDB.Bson.Serialization.IBsonSerializerExtensions.Serialize(IBsonSerializer serializer, BsonSerializationContext context, Object value)
   at MongoDB.Bson.Serialization.Serializers.BsonValueSerializerBase`1.Serialize(BsonSerializationContext context, BsonSerializationArgs args, TBsonValue value)
   at MongoDB.Bson.Serialization.Serializers.BsonDocumentSerializer.SerializeValue(BsonSerializationContext context, BsonSerializationArgs args, BsonDocument value)
   at MongoDB.Bson.Serialization.Serializers.BsonValueSerializerBase`1.Serialize(BsonSerializationContext context, BsonSerializationArgs args, TBsonValue value)
   at MongoDB.Bson.Serialization.IBsonSerializerExtensions.Serialize[TValue](IBsonSerializer`1 serializer, BsonSerializationContext context, TValue value)
   at MongoDB.Driver.Core.WireProtocol.Messages.Encoders.BinaryEncoders.QueryMessageBinaryEncoder.WriteQuery(BsonBinaryWriter binaryWriter, BsonDocument query, IElementNameValidator queryValidator)
   at MongoDB.Driver.Core.WireProtocol.Messages.Encoders.BinaryEncoders.QueryMessageBinaryEncoder.WriteMessage(QueryMessage message)
   at MongoDB.Driver.Core.Connections.BinaryConnection.SendMessagesHelper.EncodeMessages(CancellationToken cancellationToken)
   at MongoDB.Driver.Core.Connections.BinaryConnection.<SendMessagesAsync>d__57.MoveNext()