This error occasionally appears when a filer tries to view the receipt for their filing, though it most often appears when a Firm Account filer (ex: Filer A) tries to cancel an envelope submitted by another Firm Account filer (Filer B).
If the error is encountered when viewing a receipt, the filer should clear their browser's cache and cookies, then refresh the page and try viewing their envelope's receipt again.
If the error was encountered by a Firm filer trying to cancel another Firm filer's envelope, only the filer that initiated the filing (in this example: Filer B) may cancel that filing. Other filers in a Firm Account cannot cancel another filer's submissions.