hi guys , we are in a phase to migrate umbraco from 7.3.8 to latest (13) which has 50+ sites content.

we are successful till 8.18.13 , however while migrating to 9.4.3 (which supports legacy membership provider for user login ) we are getting below error after data migration

> NotSupportedException: Variation "<null>,<null>" is not supported by
> the property type. Umbraco.Cms.Core.Models.Property.SetValue(object
> value, string culture, string segment)
> Umbraco.Cms.Infrastructure.Persistence.Factories.ContentBaseFactory.BuildEntity(MemberDto
> dto, IMemberType contentType)
> Umbraco.Cms.Infrastructure.Persistence.Repositories.Implement.MemberRepository.MapDtosToContent(List<MemberDto>
> dtos, bool withCache)
> Umbraco.Cms.Infrastructure.Persistence.Repositories.Implement.MemberRepository.GetPage(IQuery<IMember>
> query, long pageIndex, int pageSize, out long totalRecords,
> IQuery<IMember> filter, Ordering ordering)
> Umbraco.Cms.Infrastructure.PublishedCache.Persistence.NuCacheContentRepository.RebuildMemberDbCache(IContentCacheDataSerializer
> serializer, int groupSize, IReadOnlyCollection<int> contentTypeIds)
> Umbraco.Cms.Infrastructure.PublishedCache.Persistence.NuCacheContentService.Rebuild(IReadOnlyCollection<int>
> contentTypeIds, IReadOnlyCollection<int> mediaTypeIds,
> IReadOnlyCollection<int> memberTypeIds)
> Umbraco.Cms.Infrastructure.PublishedCache.Persistence.NuCacheContentService.RebuildDatabaseCacheIfSerializerChanged()
> Umbraco.Cms.Core.Events.EventAggregator.PublishCore(IEnumerable<Action<INotification>>
> allHandlers, INotification notification)
> Umbraco.Cms.Core.Events.NotificationHandlerWrapperImpl<TNotification>.Handle(INotification
> notification, ServiceFactory serviceFactory,
> Action<IEnumerable<Action<INotification>>, INotification> publish)
> Umbraco.Cms.Core.Events.EventAggregator.PublishAsync<TNotification>(TNotification
> notification, CancellationToken cancellationToken)
> Umbraco.Cms.Infrastructure.Runtime.CoreRuntime.StartAsync(CancellationToken
> cancellationToken, bool isRestarting)
> Umbraco.Cms.Infrastructure.Runtime.CoreRuntime.StartAsync(CancellationToken
> cancellationToken)
> Microsoft.Extensions.Hosting.Internal.Host.StartAsync(CancellationToken
> cancellationToken)
> Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync(IHost
> host, CancellationToken token)
> Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync(IHost
> host, CancellationToken token)
> Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.Run(IHost
> host) cms9.Program.Main(string[] args) in Program.cs


    "NuCacheSerializerType": {
      "description": "The serializer type that nucache uses to persist documents in the database.\n            ",
      "default": "JSON",
      "oneOf": [
        {
          "$ref": "#/definitions/UmbracoCmsCoreConfigurationModelsNuCacheSerializerType"
        }
      ]
    },
    "UsePagedSqlQuery": {
      "type": "boolean",
      "default": false
    }