Invalid response from Shuffler DB Api endponts

at Intelliplan.CMS.Infrastructure.Services.HttpClients.ShufflerHttpClient.ParseResponseArray(HttpResponseMessage response) in D:\a\1\s\Intelliplan.CMS\Intelliplan.CMS.Infrastructure\HttpClients\ShufflerHttpClient.cs:line 262 at Intelliplan.CMS.Infrastructure.Services.HttpClients.ShufflerHttpClient.ExecuteGetArray(String path, Action`1 resultCallback) in D:\a\1\s\Intelliplan.CMS\Intelliplan.CMS.Infrastructure\HttpClients\ShufflerHttpClient.cs:line 124 at Intelliplan.CMS.Infrastructure.Services.ShufflerService.GetDescriptionHeaders() in D:\a\1\s\Intelliplan.CMS\Intelliplan.CMS.Infrastructure\Services\ShufflerService.cs:line 392 at Intelliplan.CMS.Core.Services.JobAdsService.GetDescriptionHeaders() in D:\a\1\s\Intelliplan.CMS\Intelliplan.CMS.Core\Services\JobAdsService.cs:line 144 at Intelliplan.CMS.Core.Services.MetadataDefinitionService.SimpleJobAdMetadata() in D:\a\1\s\Intelliplan.CMS\Intelliplan.CMS.Core\Services\MetadataDefinitionService.cs:line 96 at Intelliplan.CMS.Core.Services.MetadataDefinitionService.JobAdMetadata() in D:\a\1\s\Intelliplan.CMS\Intelliplan.CMS.Core\Services\MetadataDefinitionService.cs:line 71 at Intelliplan.CMS.Core.Services.MetadataDefinitionService.GetAllMetadata() in D:\a\1\s\Intelliplan.CMS\Intelliplan.CMS.Core\Services\MetadataDefinitionService.cs:line 115 at Intelliplan.CMS.Core.DomainExtensions.LinkedDataExtensions.Resolve(LinkedData this, Object args, IServiceProvider serviceProvider, Boolean asyncResolve, Boolean useCache, Boolean forPreview) in D:\a\1\s\Intelliplan.CMS\Intelliplan.CMS.Core\DomainExtensions\LinkedDataExtensions.cs:line 39