root@ptcvm2:~/charms/layers/sampledatabase# charm build
build: Composing into /root/charms
build: Destination charm directory: /root/charms/trusty/sampledatabase
Traceback (most recent call last):
  File "/usr/bin/charm-build", line 9, in <module>
    load_entry_point('charm-tools==2.1.2', 'console_scripts', 'charm-build')()
  File "/usr/lib/python2.7/dist-packages/charmtools/build/__init__.py", line 673, in main
    build()
  File "/usr/lib/python2.7/dist-packages/charmtools/build/__init__.py", line 516, in __call__
    self.generate()
  File "/usr/lib/python2.7/dist-packages/charmtools/build/__init__.py", line 466, in generate
    layers = self.fetch()
  File "/usr/lib/python2.7/dist-packages/charmtools/build/__init__.py", line 248, in fetch
    return self.fetch_deps(self.top_layer)
  File "/usr/lib/python2.7/dist-packages/charmtools/build/__init__.py", line 252, in fetch_deps
    self.fetch_dep(layer, results)
  File "/usr/lib/python2.7/dist-packages/charmtools/build/__init__.py", line 281, in fetch_dep
    results["interfaces"].append(iface.fetch())
  File "/usr/lib/python2.7/dist-packages/charmtools/build/__init__.py", line 102, in fetch
    self._name = self.config.name
  File "/usr/lib/python2.7/dist-packages/charmtools/build/__init__.py", line 46, in config
    self._config.configure(self.config_file)
  File "/usr/lib/python2.7/dist-packages/charmtools/build/config.py", line 59, in configure
    except yaml.parser.ParserError:
AttributeError: 'module' object has no attribute 'parser'