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This seems like it could be user error, but the traceback doesn't provide useful information on where the problem could be. The relevant class is at the following URL.
https://github.com/Bcfg2/bcfg2/blob/master/src/lib/Server/Plugin.py#L1180
Traceback (most recent call last):
 File "/root/bcfg2/Bcfg2/Server/FileMonitor.py", line 64, in handle_one_event
 self.handles[event.requestID].HandleEvent(event)
 File "/root/bcfg2/Bcfg2/Server/Plugins/Packages/PackagesSources.py", line 52, in HandleEvent
 self.pkg_obj.Reload()
 File "/root/bcfg2/Bcfg2/Server/Plugins/Packages/__init__.py", line 193, in Reload
 self._load_config()
 File "/root/bcfg2/Bcfg2/Server/Plugins/Packages/__init__.py", line 203, in _load_config
 self._load_sources(force_update)
 File "/root/bcfg2/Bcfg2/Server/Plugins/Packages/__init__.py", line 221, in _load_sources
 if not self.disableMetaData:
 File "/root/bcfg2/Bcfg2/Server/Plugins/Packages/__init__.py", line 65, in disableMetaData
 return not self.config.getboolean("global", "resolver")
 File "/root/bcfg2/Bcfg2/Server/Plugin.py", line 1216, in getboolean
 section, option)
 File "/usr/lib64/python3.2/configparser.py", line 819, in getboolean
 raw=raw, vars=vars)
 File "/usr/lib64/python3.2/configparser.py", line 793, in _get
 return conv(self.get(section, option, **kwargs))
TypeError: get() got an unexpected keyword argument 'raw'
Please let me know if more information is required.

Looking at the traceback and your code, configparser is calling 'get', expecting to call its own get method (that takes a 'raw' keyword), but instead is calling the get on your subclass, which doesn't take a 'raw' keyword. 
Since this appears to be example code, probably what you should do to fix this is remove those get methods. Your 'default' is spelled 'fallback' in Python3.2 configparser and does the same thing your code does.