[mlflow ui] FileNotFoundError: [WinError 2] The system cannot find the file specified

After successfully installing mlflow using pip install mlflow on my Windows system, I am trying to run the mlflow ui command but it throws the following error.

(base) C:\Users\MAC Pathak\Documents\Projects\kaggle_stroke_prediction>mlflow ui
Traceback (most recent call last):
  File "c:\programdata\anaconda3\lib\runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "c:\programdata\anaconda3\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\ProgramData\Anaconda3\Scripts\mlflow.exe\__main__.py", line 7, in <module>
  File "C:\Users\MAC Pathak\AppData\Roaming\Python\Python38\site-packages\click\core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "C:\Users\MAC Pathak\AppData\Roaming\Python\Python38\site-packages\click\core.py", line 782, in main
    rv = self.invoke(ctx)
  File "C:\Users\MAC Pathak\AppData\Roaming\Python\Python38\site-packages\click\core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "C:\Users\MAC Pathak\AppData\Roaming\Python\Python38\site-packages\click\core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "C:\Users\MAC Pathak\AppData\Roaming\Python\Python38\site-packages\click\core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "c:\programdata\anaconda3\lib\site-packages\mlflow\cli.py", line 280, in ui
    _run_server(backend_store_uri, default_artifact_root, host, port, None, 1)
  File "c:\programdata\anaconda3\lib\site-packages\mlflow\server\__init__.py", line 138, in _run_server
    exec_cmd(full_command, env=env_map, stream_output=True)
  File "c:\programdata\anaconda3\lib\site-packages\mlflow\utils\process.py", line 34, in exec_cmd
    child = subprocess.Popen(
  File "c:\programdata\anaconda3\lib\subprocess.py", line 854, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "c:\programdata\anaconda3\lib\subprocess.py", line 1307, in _execute_child
    hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
FileNotFoundError: [WinError 2] The system cannot find the file specified

[ak10net]

Add path location of mlflow package to your environment variables if global install check if mlflow is in C:\Users\user\AppData\Roaming\Python\Python37\site-packages.

If you are using Virtualenv use that path such as S:\dir\venv\Lib\site-packages\mlflow.

If problem still persists. Clear pip chache with ‘pip cache purge’ and redo the above steps.

[huidiwiwi]

I’m facing the same problem. mlflow works but mlflow ui return the same error.

when I uninstall waitress, mlflow and then reinstall mlflow, it works then. see here.

It seems like there is some version conflict of waitress if you have installed mlflow before. I guess uninstall mlflow will not automatically cleanup waitress. ps: I got mlflow command not recognized at first.(installed mlflow in a new conda env). After I uninstalled the mlflow from root, then reinstall it in the env, it works.