nvim_traceback

Error detected while processing /home/bjorn/config/vim/nvimrc:
line  337:
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/home/bjorn/.local/lib/python2.7/site-packages/neovim-0.0.6-py2.7.egg/neovim/__init__.py", line 34, in start_host
    with PluginHost(vim, discovered_plugins=[ScriptHost]) as host:
  File "/home/bjorn/.local/lib/python2.7/site-packages/neovim-0.0.6-py2.7.egg/neovim/plugin_host.py", line 46, in __enter__
    self.install_plugins()
  File "/home/bjorn/.local/lib/python2.7/site-packages/neovim-0.0.6-py2.7.egg/neovim/plugin_host.py", line 69, in install_plugins
    self.discover_plugins()
  File "/home/bjorn/.local/lib/python2.7/site-packages/neovim-0.0.6-py2.7.egg/neovim/plugin_host.py", line 59, in discover_plugins
    for loader, name, is_pkg in pkgutil.walk_packages([directory]):
  File "/usr/lib/python2.7/pkgutil.py", line 110, in walk_packages
    __import__(name)
  File "/home/bjorn/.local/lib/python2.7/site-packages/neovim-0.0.6-py2.7.egg/neovim/plugin_host.py", line 184, in find_module
    _find_module(fullname, fullname, path or _get_paths()))
  File "/home/bjorn/.local/lib/python2.7/site-packages/neovim-0.0.6-py2.7.egg/neovim/plugin_host.py", line 170, in _find_module
    return load_module(fullname, *fmr)
  File "/home/bjorn/.vim/bundle/ultisnips/pythonx/UltiSnips/__init__.py", line 11, in <module>
    vim.eval('g:UltiSnipsExpandTrigger'),
  File "/home/bjorn/.local/lib/python2.7/site-packages/neovim-0.0.6-py2.7.egg/neovim/client.py", line 360, in <lambda>
    vim_class.eval = lambda *a, **ka: process_eval_result(eval_orig(*a, **ka))
  File "/home/bjorn/.local/lib/python2.7/site-packages/neovim-0.0.6-py2.7.egg/neovim/client.py", line 322, in fun
    return async_func(*args, **kwargs).wait()
  File "/home/bjorn/.local/lib/python2.7/site-packages/neovim-0.0.6-py2.7.egg/neovim/client.py", line 33, in wait
    return process_response(self.message)
  File "/home/bjorn/.local/lib/python2.7/site-packages/neovim-0.0.6-py2.7.egg/neovim/client.py", line 15, in process_response
    raise VimError(message.error)
neovim.util.VimError: Vim:E121: Undefined variable: g:UltiSnipsExpandTrigger
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