The important part in the output comes right after the part you posted.
It’s also a good idea to format error messages the same way one would format code, following the instructions in the pinned thread; and it’s helpful to ask a question or say what it is that you’re trying to figure out, instead of only posting an error message and hoping someone will understand what you want.
It’s especially helpful to explain what you are trying to do. “install.py” could be anyone’s code. I assume it’s meant for installing something, but it helps to at least say what you are trying to install, and explain the environment. I see you are using a virtual environment, for example, but I don’t see what version of Python it uses, or what version of Pip.