After copying and pasting path, i.e. C:\Project\etc\ there was a System Exception. Removing the trailing whitespace fixes the issue.
`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 1136
--- 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 1222
at ASU.UI.MainForm.ExportButton_Click(Object sender, EventArgs e) in C:\Users\MCooper\Documents\GitHub\Alferd-Spritesheet-Unpacker\ASU\UI\MainForm.cs:line 1228`
After copying and pasting path, i.e. C:\Project\etc\ there was a System Exception. Removing the trailing whitespace fixes the issue.
`System.Exception: An error occured whilst exporting frames. ---> System.Runtime.InteropServices.ExternalException: A generic error occurred in GDI+.