XFDF Exception Stack Trace

Something went wrong while trying to convert the XFDF data:

Object reference not set to an instance of an object.

   at MPMB_PDF_to_FoundryVTT.CSharp.Converters.MpmbToFoundryConverter.ConvertCharacterClassesAsync() in U:\Godot\Projects\2022\MPMB_PDF_to_FoundryVTT\CSharp\Converters\MpmbToFoundryConverter.cs:line 911
   at MPMB_PDF_to_FoundryVTT.CSharp.Converters.MpmbToFoundryConverter.Convert(MPMBCHaracterData mpmbCharacterData, FoundryCharacterData foundryTemplateData, MainWindow mainWindow) in U:\Godot\Projects\2022\MPMB_PDF_to_FoundryVTT\CSharp\Converters\MpmbToFoundryConverter.cs:line 41
   at MainWindow.LoadXFDFFromTextAsync() in U:\Godot\Projects\2022\MPMB_PDF_to_FoundryVTT\CSharp\MainWindow.cs:line 346