Tried to challenge PoliceSheep to a debate, then when I clicked the "Create Debate" button I got that error message.
internal error.html: https://anonfile.com/5d1er6a1ob/Internal_error_html
internal error.mhtml: https://anonfile.com/7613rea2o6/Internal_error_mhtml
internal error_files.rar: https://anonfile.com/9d2ar6a0oe/Internal_error_files_rar
apparently the site still thinks the debate was created so it stored it and it can be visited https://www.debateart.com/debates/1788/electoral-college but when I tried to archive the link it just archived the main page instead: http://archive.ph/SeaEw