Why can't the CPC client sign an electronic patent application?
Your computer system is W7 and W8, right? That dialog box always appears, as if it has been installed and can't be used. I switched to an XP system and ran CPC, so I'll be fine.
In addition, the signature failure may be due to the format problem of the file you submitted. If there is an error, the signature will fail. Suggest that he check it again when he signs it.