[Python] Why does pyinstaller generated exe fail with module not found giving a strange module...

I am running pyinstaller 6.8.0 on Windows 10

my application runs correctly when called from the terminal (python .../main.py)

I can build it using pyinstaller with no error messages

When I run the exe it fails with the error

File "psiconfig\toml_config.py", line 2, in ModuleNotFoundError: No module named '3c22db458360489351e4__mypyc'
​

Line 2 of tomli_config,py is:

import toml

If I run python REPL I am able to import tomli with no errors

this is my spec file

# -*- mode: python ; coding: utf-8 -*-


a = Analysis(
['C:\\Users\\jeffw\\projects\\basic_app\\basic_app\\src\\main.py'],
pathex=[],
binaries=[],
datas=[('basic_app/images/icon.png', 'images')],
hiddenimports=['tomli'],
hookspath=[],
hooksconfig={},
runtime_hooks=[],
excludes=[],
noarchive=False,
optimize=0,
)
pyz = PYZ(a.pure)

exe = EXE(
pyz,
a.scripts,
a.binaries,
a.datas,
[],
name='BasicApp.exe',
debug=False,
bootloader_ignore_signals=False,
strip=False,
upx=True,
upx_exclude=[],
runtime_tmpdir=None,
console=False,
disable_windowed_traceback=False,
argv_emulation=False,
target_arch=None,
codesign_identity=None,
entitlements_file=None,
icon=['basic_app\\images\\icon.ico'],
)


How do I solve this?

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