I don't know how many people here use this program, but I'm trying to unpack a spritesheet of KOF 2000's select portraits. However, as I do so, I run into this error:

System.Exception: An error occured whilst exporting frames.
---> System.Runtime.InteropServices.ExternalException: A generic error occurred in GDI+.   

     at System.Drawing.Image.Save(String filename, ImageCodecInfo encoder, EncoderParameters encoderParams)   
     at ASU.UI.MainForm.ExportUnpackers(List`1 unpackers) in C:\Users\MCooper\Documents\GitHub\Alferd-Spritesheet-Unpacker\ASU\UI\MainForm.cs:line 1050   
     --- End of inner exception stack trace ---   

     at ASU.UI.MainForm.ExportUnpackers(List`1 unpackers) in C:\Users\MCooper\Documents\GitHub\Alferd-Spritesheet-Unpacker\ASU\UI\MainForm.cs:line 1136   
     at ASU.UI.MainForm.ExportButton_Click(Object sender, EventArgs e) in C:\Users\MCooper\Documents\GitHub\Alferd-Spritesheet-Unpacker\ASU\UI\MainForm.cs:line 1142

Any help?

EDIT: After tooling with the options, I fixed this problem.