My stack: .net5, webapi application, Syncfusion.HtmlToPdfConverter
From scratch: I had installed and working syncfusion library (Syncfusion.HtmlToPdfConverter.QtWebKit.Net.Core) in version 18.3.0.47 which was suddenly stoped working with error:
Syncfusion.Pdf.PdfException: Html conversion failed
at Syncfusion.HtmlConverter.HtmlConverter.CheckConversionDone(String tempFilePath)
at Syncfusion.HtmlConverter.HtmlConverter.ConvertHtmlToPdf(String url, Int32 width, Int32 height, String tempFile)
at Syncfusion.HtmlConverter.HtmlToPdfConverter.Convert(String url)
at Syncfusion.HtmlConverter.HtmlToPdfConverter.Convert(String html, String baseurl)
This is not fault html themplate becouse it is simple HTML DOM, I tried up library to the newest version and install newest syncfusion webkit, force debugging application in x64 mode, install newest .net version, update QtBinariesDotNetCore, rebuild solution, clone repository to new clean folder, clear nugetcache.