./scons.py error in building

I am in the stage of trying to install and build rosetta and I have reached the point where I am using scons.py.

I have been following the guide (https://www.rosettacommons.org/demos/latest/tutorials/install_build/install_build) so far, but I reach a road block when I build with scons.py. my commands and the results are as follows:

[2019-11-07 10:12.27]  ~/MyDocuments/rosetta/rosetta_src_2019.42.60994_bundle/main/source

[Ejer.Lenovo-PC] ? ./scons.py -j 20 mode=release bin

scons: Reading SConscript files …

      2 [main] python2.7 8932 child_info_fork::abort: address space needed by ‘cStringIO.dll’ (0x1F0000) is already occupied

      2 [main] python2.7 6928 child_info_fork::abort: address space needed by ‘_lsprof.dll’ (0x690000) is already occupied

      6 [main] python2.7 1248 child_info_fork::abort: address space needed by ‘cStringIO.dll’ (0x1F0000) is already occupied

      2 [main] python2.7 5836 child_info_fork::abort: address space needed by ‘_lsprof.dll’ (0x690000) is already occupied

      5 [main] python2.7 7324 child_info_fork::abort: address space needed by ‘_lsprof.dll’ (0x690000) is already occupied

      2 [main] python2.7 16176 child_info_fork::abort: address space needed by ‘_lsprof.dll’ (0x690000) is already occupied

Traceback (most recent call last):

  File “/drives/C/Users/Ejer/DOCUME~1/rosetta/rosetta_src_2019.42.60994_bundle/main/source/SConstruct”, line 149, in main

    build = SConscript(“tools/build/setup.py”)

  File “/drives/C/Users/Ejer/DOCUME~1/rosetta/rosetta_src_2019.42.60994_bundle/main/source/external/scons-local/scons-local-3.0.4/SCons/Script/SConscript.py”, line 667, in __call__

    return method(*args, **kw)

  File “/drives/C/Users/Ejer/DOCUME~1/rosetta/rosetta_src_2019.42.60994_bundle/main/source/external/scons-local/scons-local-3.0.4/SCons/Script/SConscript.py”, line 604, in SConscript

    return _SConscript(self.fs, *files, **subst_kw)

  File “/drives/C/Users/Ejer/DOCUME~1/rosetta/rosetta_src_2019.42.60994_bundle/main/source/external/scons-local/scons-local-3.0.4/SCons/Script/SConscript.py”, line 285, in _SConscript

    call_stack[-1].globals)

  File “/drives/C/Users/Ejer/DOCUME~1/rosetta/rosetta_src_2019.42.60994_bundle/main/source/tools/build/setup.py”, line 451, in <module>

    build = setup()

  File “/drives/C/Users/Ejer/DOCUME~1/rosetta/rosetta_src_2019.42.60994_bundle/main/source/tools/build/setup.py”, line 441, in setup

    build.options_requested, build.options = setup_build_options()

  File “/drives/C/Users/Ejer/DOCUME~1/rosetta/rosetta_src_2019.42.60994_bundle/main/source/tools/build/setup.py”, line 107, in setup_build_options

    requested.os = setup_platforms.select_os(supported, requested.os)

  File “/drives/C/Users/Ejer/DOCUME~1/rosetta/rosetta_src_2019.42.60994_bundle/main/source/tools/build/setup_platforms.py”, line 120, in select_os

    raise KeyError(“Operating system ‘%s’ is unsupported.” % (actual))

KeyError: “Operating system ‘cygwin_nt-10.0-wow’ is unsupported.”

scons: done reading SConscript files.

scons: Building targets …

scons: `bin’ is up to date.

scons: done building targets.

and then it stops after a few seconds, while the guide mentions that it will take hours. what is doing on and what can I do to help it ?