Something went wrong while trying to convert the XFDF data:

Index and length must refer to a location within the string. (Parameter 'length')

   at System.String.Substring(Int32 startIndex, Int32 length)
   at MPMB_PDF_to_FoundryVTT.CSharp.Importers.MPMBImporter.ExtractClasses() in U:\Godot\Projects\2022\MPMB_PDF_to_FoundryVTT\CSharp\Importers\MPMBImporter.cs:line 718
   at MPMB_PDF_to_FoundryVTT.CSharp.Importers.MPMBImporter.LoadCharacterData() in U:\Godot\Projects\2022\MPMB_PDF_to_FoundryVTT\CSharp\Importers\MPMBImporter.cs:line 61
   at MPMB_PDF_to_FoundryVTT.CSharp.Importers.MPMBImporter.XfdfStringToCharacterData(String xfdf) in U:\Godot\Projects\2022\MPMB_PDF_to_FoundryVTT\CSharp\Importers\MPMBImporter.cs:line 51
   at MainWindow.LoadXFDFFromTextAsync() in U:\Godot\Projects\2022\MPMB_PDF_to_FoundryVTT\CSharp\MainWindow.cs:line 337