File "deploy.py", line 146, in <module>
    main()  # pylint: disable=no-value-for-parameter
  File "/home/ankur/raidennode1/lib/python3.6/site-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/home/ankur/raidennode1/lib/python3.6/site-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/home/ankur/raidennode1/lib/python3.6/site-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/ankur/raidennode1/lib/python3.6/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "deploy.py", line 141, in main
    deployed = deploy_all(client)
  File "deploy.py", line 112, in deploy_all
    compiled_contracts = allcontracts(RAIDEN_CONTRACT_FILES)
  File "deploy.py", line 90, in allcontracts
    for c in contract_files
  File "deploy.py", line 90, in <dictcomp>
    for c in contract_files
  File "/home/ankur/raidennode1/lib/python3.6/site-packages/ethereum/tools/_solidity.py", line 322, in compile_contract
    extra_args=extra_args
  File "/home/ankur/raidennode1/lib/python3.6/site-packages/ethereum/tools/_solidity.py", line 282, in compile_file
    output = subprocess.check_output(args, cwd=workdir)
  File "/usr/local/lib/python3.6/subprocess.py", line 336, in check_output
    **kwargs).stdout
  File "/usr/local/lib/python3.6/subprocess.py", line 403, in run
    with Popen(*popenargs, **kwargs) as process:
  File "/usr/local/lib/python3.6/subprocess.py", line 709, in __init__
    restore_signals, start_new_session)
  File "/usr/local/lib/python3.6/subprocess.py", line 1258, in _execute_child
    executable = os.fsencode(executable)
  File "/usr/local/lib/python3.6/os.py", line 800, in fsencode
    filename = fspath(filename)  # Does type-checking of `filename`.
TypeError: expected str, bytes or os.PathLike object, not NoneType