Creating reports and dashboards | Stimulsoft community forum

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System.AggregateException: One or more errors occurred. (Exception in PdfFonts.GetFontMetrics, font 'Arial' step #50: 'Operations that change non-concurrent collections must have exclusive access. A concurrent update was performed on this collection and corrupted its state. The collection's state is no longer correct.') (Exception in PdfFonts.GetFontMetrics, font 'Arial' step #50: 'Operations that change non-concurrent collections must have exclusive access. A concurrent update was performed on this collection and corrupted its state. The collection's state is no longer correct.') (Exception in PdfFonts.GetFontMetrics, font 'Arial' step #50: 'Operations that change non-concurrent collections must have exclusive access. A concurrent update was performed on this collection and corrupted its state. The collection's state is no longer correct.') (Exception in PdfFonts.GetFontMetrics, font 'Arial' step #50: 'Operations that change non-concurrent collections must have exclusive access. A concurrent update was performed on this collection and corrupted its state. The collection's state is no longer correct.') (Exception in PdfFonts.GetFontMetrics, font 'Arial' step #50: 'Operations that change non-concurrent collections must have exclusive access. A concurrent update was performed on this collection and corrupted its state. The collection's state is no longer correct.')
 ---> System.Exception: Exception in PdfFonts.GetFontMetrics, font 'Arial' step #50: 'Operations that change non-concurrent collections must have exclusive access. A concurrent update was performed on this collection and corrupted its state. The collection's state is no longer correct.'
   at Stimulsoft.Report.Export.PdfFonts.GetFontMetrics(Font font, PdfFontInfo currentFontInfo, UInt16[] glyphMap, Boolean isWpf)
   at Stimulsoft.Report.Export.PdfFonts.InitFontsData(Boolean isWpf)
   at Stimulsoft.Report.Export.StiPdfExportService.ExportPdf1(StiReport report, Stream stream, StiPdfExportSettings settings)
   at Stimulsoft.Report.Export.StiPdfExportService.ExportPdf(StiReport report, Stream stream, StiPdfExportSettings settings)
   at Stimulsoft.Report.StiReport.ExportDocument(StiExportFormat exportFormat, StiExportService exportService, Stream stream, StiExportSettings settings)
   at Stimulsoft.Report.StiReport.ExportDocument(StiExportFormat exportFormat, Stream stream, StiExportSettings settings)
   at Program.CreateReport() in C:\Dev\lnb_new\backend\src\ConsoleApp1\Program.cs:line 47

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public static void Main(string[] args)
    {
        var tasks = new List<Task>
        {
            Task.Factory.StartNew(CreateReport),
            Task.Factory.StartNew(CreateReport),
            Task.Factory.StartNew(CreateReport),
            Task.Factory.StartNew(CreateReport),
            Task.Factory.StartNew(CreateReport)
        };

        Task.WaitAll(tasks.ToArray());
        Console.WriteLine("Done!");
    }

    private static Task CreateReport()
    {
        StiLicense.Key = _licenseKey;
        StiOptions.Export.Pdf.CreatorString = "Stimulsoft";

        var template = File.ReadAllBytes("Report.mrt");
        var report = new StiReport();
        report.Load(template);
        var memoryStream = new MemoryStream();
        report.Render(false);
        var settings = new StiPdfExportSettings { PdfComplianceMode = StiPdfComplianceMode.A1 };
        report.ExportDocument(StiExportFormat.Pdf, memoryStream, settings);
        memoryStream.Seek(0, SeekOrigin.Begin);

        return Task.CompletedTask;
    }

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public static void Main(string[] args)
    {
        var tasks = new List<Task>
        {
            Task.Factory.StartNew(CreateReport),
            Task.Factory.StartNew(CreateReport),
            Task.Factory.StartNew(CreateReport),
            Task.Factory.StartNew(CreateReport),
            Task.Factory.StartNew(CreateReport)
        };

        Task.WaitAll(tasks.ToArray());
        Console.WriteLine("Done!");
    }

    private static Task CreateReport()
    {
        StiLicense.Key = _licenseKey;
        StiOptions.Export.Pdf.CreatorString = "Stimulsoft";

        var template = File.ReadAllBytes("Report.mrt");
        var report = new StiReport();
        report.Load(template);
        var memoryStream = new MemoryStream();
        report.Render(false);
        var settings = new StiPdfExportSettings { PdfComplianceMode = StiPdfComplianceMode.A1 };
        report.ExportDocument(StiExportFormat.Pdf, memoryStream, settings);
        memoryStream.Seek(0, SeekOrigin.Begin);

        return Task.CompletedTask;
    }