An unexpected error occurred: AttributeError: 'Namespace' object has no attribute 'key_dir'

[Ceratius]

Hello there,
I wanted try this pretty awesome-sounding tool. However, after successful installation and after installing the root certificate, when trying to request an S/MIME certificate, after the "You are requesting a S/MIME certificate" header, I receive the error

An unexpected error occurred:
AttributeError: 'Namespace' object has no attribute 'key_dir'

The full stack trace is as follows:

2025-03-26 20:34:12,009:DEBUG:certbot._internal.log:Exiting abnormally: Traceback (most recent call last): File "cli.py", line 264, in <module> main(args) File "cli.py", line 202, in main request_cert(args, config) File "cli.py", line 61, in request_cert key, csr = csr_util.prepare(args.email, config, key_path=args.key_path, usage=args.usage) File "C:\Users\cerat\Downloads\acme_email-0.14.1\certbot_castle\csr.py", line 77, in prepare key = key or crypto_util.generate_key(config.rsa_key_size, config.key_dir) File "C:\Users\cerat\Downloads\acme_email-0.14.1\venv\lib\site-packages\certbot\configuration.py", line 176, in __getattr__ value = getattr(self.namespace, name) AttributeError: 'Namespace' object has no attribute 'key_dir' 2025-03-26 20:34:12,010:ERROR:certbot._internal.log:An unexpected error occurred: 2025-03-26 20:34:12,010:ERROR:certbot._internal.log:AttributeError: 'Namespace' object has no attribute 'key_dir'

I am pretty new to python, so the error may be easy to solve, but I haven't found a solution yet. Any ideas what causes this?

[W0153R]

The key_dir attribute was removed in version 3.0.0. To fix this, on line 15 in setup.py change:
certbot>=1.20.0
into
certbot<3.0