I'm trying to run project : Yowsup github project I keep having this error message : ModuleNotFoundError: No module named 'axolotl_curve25519' When I try to install it using : pip install python-axolotl-curve25519 I keep having this error messages : C:\Users\Administrateur\Desktop\ws\yowsup-master>pip install python-axolotl-curve25519 Collecting python-axolotl-curve25519 Using cached python-axolotl-curve25519-0.4.1.post2.tar.gz (79 kB) Preparing metadata (setup.py) ... done Building wheels for collected packages: python-axolotl-curve25519 Building wheel for python-axolotl-curve25519 (setup.py) ... error error: subprocess-exited-with-error × python setup.py bdist_wheel did not run successfully. │ exit code: 1 ╰─> [17 lines of output] c:\users\administrateur\appdata\local\programs\python\python39\lib\site-packages\setuptools\dist.py:463: UserWarning: Normalizing '0.4.1-2' to '0.4.1.post2' warnings.warn(tmpl.format(**locals())) running bdist_wheel running build running build_ext building 'axolotl_curve25519' extension creating build creating build\temp.win-amd64-3.9 creating build\temp.win-amd64-3.9\Release creating build\temp.win-amd64-3.9\Release\curve creating build\temp.win-amd64-3.9\Release\curve\ed25519 creating build\temp.win-amd64-3.9\Release\curve\ed25519\additions creating build\temp.win-amd64-3.9\Release\curve\ed25519\nacl_sha512 C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\VC\Tools\MSVC\14.27.29110\bin\HostX86\x64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -Icurve/ed25519/nacl_includes -Icurve/ed25519/additions -Icurve/ed25519 -Ic:\users\administrateur\appdata\local\programs\python\python39\include -Ic:\users\administrateur\appdata\local\programs\python\python39\include -IC:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\VC\Tools\MSVC\14.27.29110\include /Tccurve/curve25519-donna.c /Fobuild\temp.win-amd64-3.9\Release\curve/curve25519-donna.obj curve25519-donna.c curve/curve25519-donna.c(48): fatal error C1083: Impossible d'ouvrir le fichier includeÿ: 'string.h'ÿ: No such file or directory error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\BuildTools\\VC\\Tools\\MSVC\\14.27.29110\\bin\\HostX86\\x64\\cl.exe' failed with exit code 2 [end of output] note: This error originates from a subprocess, and is likely not a problem with pip. ERROR: Failed building wheel for python-axolotl-curve25519 Running setup.py clean for python-axolotl-curve25519 Failed to build python-axolotl-curve25519 Installing collected packages: python-axolotl-curve25519 Running setup.py install for python-axolotl-curve25519 ... error error: subprocess-exited-with-error × Running setup.py install for python-axolotl-curve25519 did not run successfully. │ exit code: 1 ╰─> [17 lines of output] c:\users\administrateur\appdata\local\programs\python\python39\lib\site-packages\setuptools\dist.py:463: UserWarning: Normalizing '0.4.1-2' to '0.4.1.post2' warnings.warn(tmpl.format(**locals())) running install running build running build_ext building 'axolotl_curve25519' extension creating build creating build\temp.win-amd64-3.9 creating build\temp.win-amd64-3.9\Release creating build\temp.win-amd64-3.9\Release\curve creating build\temp.win-amd64-3.9\Release\curve\ed25519 creating build\temp.win-amd64-3.9\Release\curve\ed25519\additions creating build\temp.win-amd64-3.9\Release\curve\ed25519\nacl_sha512 C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\VC\Tools\MSVC\14.27.29110\bin\HostX86\x64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -Icurve/ed25519/nacl_includes -Icurve/ed25519/additions -Icurve/ed25519 -Ic:\users\administrateur\appdata\local\programs\python\python39\include -Ic:\users\administrateur\appdata\local\programs\python\python39\include -IC:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\VC\Tools\MSVC\14.27.29110\include /Tccurve/curve25519-donna.c /Fobuild\temp.win-amd64-3.9\Release\curve/curve25519-donna.obj curve25519-donna.c curve/curve25519-donna.c(48): fatal error C1083: Impossible d'ouvrir le fichier includeÿ: 'string.h'ÿ: No such file or directory error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\BuildTools\\VC\\Tools\\MSVC\\14.27.29110\\bin\\HostX86\\x64\\cl.exe' failed with exit code 2 [end of output] note: This error originates from a subprocess, and is likely not a problem with pip. error: legacy-install-failure × Encountered error while trying to install package. ╰─> python-axolotl-curve25519 note: This is an issue with the package mentioned above, not pip. hint: See above for output from the failure. Continue reading...