In PyYAML 6, [the `pyyaml.load` function started requiring a second parameter](https://github.com/yaml/pyyaml/pull/561). `zconfig.YAMLConfig.load_config` calls that function if the `config_buffer` parameter is passed, and does not provide one, thus failing with PyYAML 6.
In PyYAML 6, the
pyyaml.loadfunction started requiring a second parameter.zconfig.YAMLConfig.load_configcalls that function if theconfig_bufferparameter is passed, and does not provide one, thus failing with PyYAML 6.