Traceback (most recent call last):


 "c:\tools\python3\lib\site-packages\conans\client\command.py", line 1230, in run

method(args[0][1:])


 "c:\tools\python3\lib\site-packages\conans\client\command.py", line 325, in install

install_folder=args.install_folder)


 "c:\tools\python3\lib\site-packages\conans\client\conan_api.py", line 79, in wrapper

return f(*args, **kwargs)


 "c:\tools\python3\lib\site-packages\conans\client\conan_api.py", line 466, in install

manager.install_workspace(profile, workspace, remote, build, update)


 "c:\tools\python3\lib\site-packages\conans\client\manager.py", line 218, in install_workspace

workspace.generate()


 "c:\tools\python3\lib\site-packages\conans\model\workspace.py", line 114, in generate

build_folder = workspace_package.build_folder


 "c:\tools\python3\lib\site-packages\conans\model\workspace.py", line 38, in build_folder

folder = self._evaluate(self._build_folder)


 "c:\tools\python3\lib\site-packages\conans\model\workspace.py", line 70, in _evaluate

settings = self.conanfile.settings
AttributeError: 'NoneType' object has no attribute 'settings'

Traceback (most recent call last):


 "main.py", line 44, in <module>

buf = engine.serialize()
AttributeError: 'NoneType' object has no attribute 'serialize'`