old_contents: """Server extension for JupyterLab."""
  
  # Copyright (c) Jupyter Development Team.
  # Distributed under the terms of the Modified BSD License.
  
  try:
      from ._version import __version__
  except ImportError as e:
      # when we are python 3 only, add 'from e' at the end to chain the exception.
      raise ImportError("No module named 'jupyter._version'. Build the jupyterlab package to generate this module, for example, with `pip install -e /path/to/jupyterlab/repo`.")
  
  from .extension import load_jupyter_server_extension
  
  def _jupyter_server_extension_paths():
      return [{
          "module": "jupyterlab"
      }]
  
new_contents: """Server extension for JupyterLab."""
  
  # Copyright (c) Jupyter Development Team.
  # Distributed under the terms of the Modified BSD License.
  
  try:
      from ._version import __version__
  except ImportError as e:
      # when we are python 3 only, add 'from e' at the end to chain the exception.
      raise ImportError("No module named 'jupyterlab._version'. Build the jupyterlab package to generate this module, for example, with `pip install -e /path/to/jupyterlab/repo`.")
  
  from .extension import load_jupyter_server_extension
  
  def _jupyter_server_extension_paths():
      return [{
          "module": "jupyterlab"
      }]
  
subject: Fix jupyterlab import error message