Export to File in Group stopped working (strange error)

How were you able to generate that error in C#?  All I can get out of the body is these.

public string Id { get; set; }
[JsonProperty(PropertyName = "createdDateTime")]
public DateTime? CreatedDateTime { get; set; }
[JsonProperty(PropertyName = "lastActionDateTime")]
public DateTime? LastActionDateTime { get; set; }
[JsonProperty(PropertyName = "reportId")]
public Guid? ReportId { get; set; }
[JsonProperty(PropertyName = "reportName")]
public string ReportName { get; set; }
[JsonProperty(PropertyName = "status")]
public ExportState? Status { get; set; }
[JsonProperty(PropertyName = "percentComplete")]
public int? PercentComplete { get; set; }
[JsonProperty(PropertyName = "resourceLocation")]
public string ResourceLocation { get; set; }
[JsonProperty(PropertyName = "ResourceFileExtension")]
public string ResourceFileExtension { get; set; }
[JsonProperty(PropertyName = "expirationTime")]
public DateTime? ExpirationTime { get; set; }