Seafile Notification ERROR

Seafile does not send notifications. In the log file
you can find the following error. But it is not clear to me what to do. Can someone help?

/opt/seafile/seafile-pro-server-9.0.13/seahub/thirdpart/requests/init.py:102: RequestsDependencyWarning: urllib3 (1.26.12) or chardet (5.0.0)/charset_normalizer (2.0.12) doesn’t match a supported version!
warnings.warn("urllib3 ({}) or chardet ({})/charset_normalizer ({}) doesn’t match a supported "

Check imported dependencies for compatibility.

try:
check_compatibility(urllib3.version, chardet_version, charset_normalizer_version)
except (AssertionError, ValueError):
warnings.warn("urllib3 ({}) or chardet ({})/charset_normalizer ({}) doesn’t match a supported "
“version!”.format(urllib3.version, chardet_version, charset_normalizer_version),
RequestsDependencyWarning)