No module name 'cupy' when OpenPose tries to run on GPU

 (OpenPose) C:\Users\Username\Documents\open_pose\Chainer_Realtime_Multi-P
person_Pose_Estimation>python pose_detector.py posenet models/coco_posenet.npz --
img data/person.png --gpu0
Loading the model...
Traceback (most recent call last):
  File "pose_detector.py", line 568, in<module>
    pose_detector=PoseDetector(args.arch, args.weights, device=args.gpu, preci
se=args.precise)
  File "pose_detector.py", line 30, in __init__
    cuda.get_device_from_id(device).use()
  File "C:\Users\Username\Anaconda3\envs\OpenPose\lib\site-packages\chain
er\backends\cuda.py", line 160, inget_device_from_id
    check_cuda_available()
  File "C:\Users\Username\Anaconda3\envs\OpenPose\lib\site-packages\chain
er\backends\cuda.py", line 90, check_cuda_available
    raise RuntimeError(msg)
RuntimeError: CUDA environment is not correctly set up
(see https://github.com/chainer/chainer#installation).No module named 'cupy'

(OpenPose) C:\Users\Username\Documents\open_pose\Chainer_Realtime_Multi-P
person_Pose_Estimation> pip install cupy
Collecting cupy
  Using cached https://files.pythonhosted.org/packages/38/14/ddb1a13f77a50d72181
4e28181ae90e0d57c3f8d4faa9a7b2e028cfcc99a/cupy-4.0.0.tar.gz
    Complete output from command python setup.py eg_info:
    **************************************************
    *** WARNING—Cannot find nvToolsExt.nvtx was disabled.
    **************************************************
    Options: {'package_name': 'cupy', 'long_description': None, 'wheel_libs': [ ]
, 'no_rpath': False, 'profile': False, 'linetrace': False, 'notate': False, 'n
o_cuda': False}

    -------- Configuring Module: cuda ---------
    Microsoft Visual C++ 14.0 is required.Get it with "Microsoft Visual C++ Bui
ld Tools": http://landinghub.visualstudio.com/visual-cpp-build-tools

    ************************************************************
    * CuPy Configuration Summary*
    ************************************************************

    Build Environment:
      Include directors: ['C:\\Program Files\\NVIDIA GPU Computing Toolkit\\CU
DA\\v9.1\\include', 'C:\\Program Files\\NVIDIA Corporation\\NvToolsExt\\include'
]
      Library directors: ['C:\\Program Files\\NVIDIA GPU Computing Toolkit\\CU
DA\\v9.1\\bin', 'C:\\Program Files\\NVIDIA GPU Computing Toolkit\\CUDA\\v9.1\li
b\\x64', 'C:\\Program Files\\NVIDIA Corporation\\NvToolsExt\\lib\\x64' ]
      nvcc command: ['C:\\Program Files\\NVIDIA GPU Computing Toolkit\\CU
DA\\v9.1\\bin/nvcc.exe']

    Environment Variables:
      CFLAGS: (none)
      LDFLAGS: (none)
      LIBRARY_PATH: (none)
      CUDA_PATH: C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v9.1
      NVCC: (none)

    Modules:
      cuda —No.
        ->Include files not found: ['cubras_v2.h', 'cuda.h', 'cuda_profiler_api]
.h', 'cuda_runtime.h', 'cufft.h', 'curand.h', 'cusparse.h', 'nvrtc.h']
        ->Check your CFLAGS environment variable.

    ERROR:CUDA could not be found on your system.
    Please refer to the Installation Guide for details:
    https://docs-cupy.chainer.org/en/stable/install.html

    ************************************************************

    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "C:\Users\Username\AppData\Local\Temp\pip-install-dgapbvnt\cupy\setup
.py", line 65, in <module>
        ext_modules=cupy_setup_build.get_ext_modules()
      File "C:\Users\Username\AppData\Local\Temp\pip-install-dgapbvnt\cupy\cupy_
setup_build.py", line561, inget_ext_modules
        extensions=make_extensions(arg_options, compiler, use_cython)
      File "C:\Users\Username\AppData\Local\Temp\pip-install-dgapbvnt\cupy\cupy_
setup_build.py", line374, in make_extensions
        raise Exception('Your CUDA environment is invalid.'
    Exception: Your CUDA environment is invalid. Please check above error log.

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in C:\Users\username
\AppData\Local\Temp\pipe-install-dgapbvnt\cupy\