Pyinstaller create this error :“File ”multiprocessing\“, line 691

Hi everyone,

I am trying to make the executable of my python script with Pyinstaller. I am using:
PyInstaller: 3.6
Python: 3.7.7
Windows 10 64Bits

When I run my script from Windows command terminal, it works fine. When I run the exe produced by Pyinstaller I have this error shown on terminal:

[output]Process SpawnProcess-4:
Traceback (most recent call last):
File “multiprocessing\”, line 297, in _bootstrap
File “multiprocessing\”, line 99, in run
File “concurrent\futures\”, line 233, in _process_worker
File “multiprocessing\”, line 113, in get
File “multiprocessing\”, line 943, in RebuildProxy
File “multiprocessing\”, line 793, in init
File “multiprocessing\”, line 847, in _incref
File “multiprocessing\”, line 490, in Client
File “multiprocessing\”, line 691, in PipeClient
FileNotFoundError: [WinError 2] The system cannot find the file specified
A process in the process pool was terminated abruptly while the future was running or pending. --> Error multiprocessor][/output]

This is my piece of code which create this error:

[python] with concurrent.futures.ProcessPoolExecutor() as executor:
#multiprocesses =, list_arguments_smartphones)
multiprocesses =, list_smartphones_connected,
[lock] * len(list_smartphones_connected))
for function_return_value in multiprocesses:

        except Exception as ex:
            print(f"{ex} --> Error multiprocesses")[/python]

My code start with the freeze as recommended:
[python]if name == ‘main’:
import multiprocessing

So I made the exe with the option --dir in order to make the executable with dolls, and I get exact same issue.

I run some specific Pyinstaller commands, it is displaying something, but I don’t understand what it means:

[output]E:>pyi-bindepend Myprogram.exe
Myprogram.exe {‘KERNEL32.dll’, ‘*_Microsoft.Windows.Common-Controls_6595b64144ccf1df_6.0.0.0_none’, ‘WS2_32.dll’, ‘ADVAPI32.dll’}

E:>pyi-archive_viewer Myprogram.exe
pos, length, uncompressed, iscompressed, type, name
[(0, 270, 354, 1, ‘m’, ‘struct’),
(270, 1124, 1832, 1, ‘m’, ‘pyimod01_os_path’),
(1394, 4376, 9337, 1, ‘m’, ‘pyimod02_archive’),
(5770, 7417, 18651, 1, ‘m’, ‘pyimod03_importers’),
(13187, 1868, 4175, 1, ‘s’, ‘pyiboot01_bootstrap’),
(15055, 266, 321, 1, ‘s’, ‘pyi_rth_certifi’),
(15321, 1080, 1775, 1, ‘s’, ‘pyi_rth_multiprocessing’),
(16401, 8845, 18589, 1, ‘s’, ‘Myprogram’),
(25246, 3052666, 3052666, 0, ‘z’, ‘PYZ-00.pyz’)]
so I added in the .spec file some hiddenimport:

as I saw issues with multiprocessing and futures… But it didn’t fix anything

I tried this one:

still same issue.

So I check this line 691 in this file, but I don’t understand the issue:

[python]def PipeClient(address):
Return a connection object connected to the pipe given by address
t = _init_timeout()
while 1:
_winapi.WaitNamedPipe(address, 1000)<==------------------------[line 691]
h = _winapi.CreateFile(
address, _winapi.GENERIC_READ | _winapi.GENERIC_WRITE,
0, _winapi.NULL, _winapi.OPEN_EXISTING,
except OSError as e:
if e.winerror not in (_winapi.ERROR_SEM_TIMEOUT,
_winapi.ERROR_PIPE_BUSY) or _check_timeout(t):

        h, _winapi.PIPE_READMODE_MESSAGE, None, None
    return PipeConnection(h)[/python]

I am not good enough in Python to fix this issue. I can just make the conclusion that Pyinstaller is breaking something as the script is running perfectly fine from the terminal. Also I see that system is saying it cannot find a file. So a file or module is missing, that is why I tried some stuff in .spec file.

Does anyone know the source of my problem please?