System.ArgumentException: Found empty contents
   at ZXing.QrCode.QRCodeWriter.encode(String contents, BarcodeFormat format, Int32 width, Int32 height, IDictionary`2 hints)
   at ZXing.MultiFormatWriter.encode(String contents, BarcodeFormat format, Int32 width, Int32 height, IDictionary`2 hints)
   at ZXing.BarcodeWriterGeneric.Encode(String contents)
   at ZXing.BarcodeWriter`1.Write(String contents)
   at Public.Utils.QRCode.generate(String text, Int32 width, Int32 height, Image logo, IEnumerable`1 titles)
   at ThirdPartyApi.Controllers.Api.FileController.<>c__DisplayClass8_0.<<QrCode>g__generate|0>d.MoveNext()
--- End of stack trace from previous location ---
   at ThirdPartyApi.Controllers.Api.FileController.QrCode(String content, Int32 size, String name, String[] titles, String logo)