Wrong certbot output when --csr specifies non-existing file

[CaledoniaProject]

I'm trying to generate a cert with this command,

# certbot certonly --csr server.1csr --manual
usage:
  certbot [SUBCOMMAND] [options] [-d DOMAIN] [-d DOMAIN] ...

Certbot can obtain and install HTTPS/TLS/SSL certificates.  By default,
it will attempt to use a webserver both for obtaining and installing the
certificate.
certbot: error: argument --csr: No such file or directory

However the output is misleading. It is actually server.1csr is missing, but the output tells me that certbot is treating --csr as a filename, it's very very confusing. I even tried to use certbot --csr XXX certonly instead, then I realized the output is misleading.

Please fix it.