pyOCD install issue

When trying to debug an mBed lpc1768 platformio tries to install phyOCD and fails with the following output. How to fix this?

If i run pip install pyOCD it runs fine and tells me it’s installed (but not on the path).

  Getting requirements to build wheel: started
  Getting requirements to build wheel: finished with status 'error'
undefined  error: subprocess-exited-with-error
  Getting requirements to build wheel did not run successfully.
  exit code: 1
  [67 lines of output]
  C:\Users\<user>\AppData\Local\Temp\pip-build-env-2h5mpeh1\overlay\Lib\site-packages\setuptools\dist.py:759: SetuptoolsDeprecationWarning: License classifiers are deprecated.
  !!
          ********************************************************************************
          Please consider removing the following classifiers in favor of a SPDX license expression:
          License :: OSI Approved :: MIT License
          See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license for details.
          ********************************************************************************
  !!
    self._finalize_license_expression()
  running egg_info
  writing lib3\PyYAML.egg-info\PKG-INFO
  writing dependency_links to lib3\PyYAML.egg-info\dependency_links.txt
  writing top-level names to lib3\PyYAML.egg-info\top_level.txt
  Traceback (most recent call last):
    File "C:\Users\<user>\.platformio\penv\Lib\site-packages\pip\_vendor\pyproject_hooks\_in_process\_in_process.py", line 389, in <module>
      main()
    File "C:\Users\<user>\.platformio\penv\Lib\site-packages\pip\_vendor\pyproject_hooks\_in_process\_in_process.py", line 373, in main
      json_out["return_val"] = hook(**hook_input["kwargs"])
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "C:\Users\<user>\.platformio\penv\Lib\site-packages\pip\_vendor\pyproject_hooks\_in_process\_in_process.py", line 143, in get_requires_for_build_wheel
      return hook(config_settings)
             ^^^^^^^^^^^^^^^^^^^^^
    File "C:\Users\<user>\AppData\Local\Temp\pip-build-env-2h5mpeh1\overlay\Lib\site-packages\setuptools\build_meta.py", line 331, in get_requires_for_build_wheel
      return self._get_build_requires(config_settings, requirements=[])
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "C:\Users\<user>\AppData\Local\Temp\pip-build-env-2h5mpeh1\overlay\Lib\site-packages\setuptools\build_meta.py", line 301, in _get_build_requires
      self.run_setup()
    File "C:\Users\<user>\AppData\Local\Temp\pip-build-env-2h5mpeh1\overlay\Lib\site-packages\setuptools\build_meta.py", line 317, in run_setup
      exec(code, locals())
    File "<string>", line 271, in <module>
    File "C:\Users\<user>\AppData\Local\Temp\pip-build-env-2h5mpeh1\overlay\Lib\site-packages\setuptools\__init__.py", line 115, in setup
      return distutils.core.setup(**attrs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "C:\Users\<user>\AppData\Local\Temp\pip-build-env-2h5mpeh1\overlay\Lib\site-packages\setuptools\_distutils\core.py", line 186, in setup
      return run_commands(dist)
             ^^^^^^^^^^^^^^^^^^
    File "C:\Users\<user>\AppData\Local\Temp\pip-build-env-2h5mpeh1\overlay\Lib\site-packages\setuptools\_distutils\core.py", line 202, in run_commands
      dist.run_commands()
    File "C:\Users\<user>\AppData\Local\Temp\pip-build-env-2h5mpeh1\overlay\Lib\site-packages\setuptools\_distutils\dist.py", line 1002, in run_commands
      self.run_command(cmd)
    File "C:\Users\<user>\AppData\Local\Temp\pip-build-env-2h5mpeh1\overlay\Lib\site-packages\setuptools\dist.py", line 1102, in run_command
      super().run_command(command)
    File "C:\Users\<user>\AppData\Local\Temp\pip-build-env-2h5mpeh1\overlay\Lib\site-packages\setuptools\_distutils\dist.py", line 1021, in run_command
      cmd_obj.run()
    File "C:\Users\<user>\AppData\Local\Temp\pip-build-env-2h5mpeh1\overlay\Lib\site-packages\setuptools\command\egg_info.py", line 312, in run
      self.find_sources()
    File "C:\Users\<user>\AppData\Local\Temp\pip-build-env-2h5mpeh1\overlay\Lib\site-packages\setuptools\command\egg_info.py", line 320, in find_sources
      mm.run()
    File "C:\Users\<user>\AppData\Local\Temp\pip-build-env-2h5mpeh1\overlay\Lib\site-packages\setuptools\command\egg_info.py", line 543, in run
      self.add_defaults()
    File "C:\Users\<user>\AppData\Local\Temp\pip-build-env-2h5mpeh1\overlay\Lib\site-packages\setuptools\command\egg_info.py", line 581, in add_defaults
      sdist.add_defaults(self)
    File "C:\Users\<user>\AppData\Local\Temp\pip-build-env-2h5mpeh1\overlay\Lib\site-packages\setuptools\command\sdist.py", line 109, in add_defaults
      super().add_defaults()
    File "C:\Users\<user>\AppData\Local\Temp\pip-build-env-2h5mpeh1\overlay\Lib\site-packages\setuptools\_distutils\command\sdist.py", line 245, in add_defaults
      self._add_defaults_ext()
    File "C:\Users\<user>\AppData\Local\Temp\pip-build-env-2h5mpeh1\overlay\Lib\site-packages\setuptools\_distutils\command\sdist.py", line 330, in _add_defaults_ext
      self.filelist.extend(build_ext.get_source_files())
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "<string>", line 201, in get_source_files
    File "C:\Users\<user>\AppData\Local\Temp\pip-build-env-2h5mpeh1\overlay\Lib\site-packages\setuptools\_distutils\cmd.py", line 131, in __getattr__
      raise AttributeError(attr)
  AttributeError: cython_sources
  [end of output]
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error
Getting requirements to build wheel did not run successfully.
exit code: 1
See above for output.
note: This error originates from a subprocess, and is likely not a problem with pip.
Error: Couldn't install dependencies for pyOCD!
Installing Python dependencies for pyOCD...
C:\Users\<user>\.platformio\packages\toolchain-gccarmnoneeabi\bin\arm-none-eabi-gdb.exe: warning: Couldn't determine a path for the index cache directory.
Reading symbols from c:\Users\<user>\OneDrive\Documenten\PlatformIO\Projects\<prj>\.pio\build\lpc1768\firmware.elf...
PlatformIO Unified Debugger -> https://bit.ly/pio-debug
PlatformIO: debug_tool = cmsis-dap
PlatformIO: Initializing remote target...
.pioinit:13: Error in sourced command file:
:3333: No connection could be made because the target machine actively refused it.

This is a reproducable bug.

Opened in

Can you try the workaround as detailed in the issue?