If you’re using Windows, the unix-style default path of ssh-keygen is at fault.
In Line 2 it says Enter file in which to save the key (/c/Users/Eva/.ssh/id_rsa):.
That full filename in the parantheses is the default, obviously Windows cannot access a file like that. If you type the Windows equivalent (c:\Users\Eva\.ssh\id_rsa), it should work.
Before running this, you also need to create the folder. You can do this by running mkdir c:\Users\Eva\.ssh, or by created the folder “.ssh.” from File Explorer (note the second dot at the end, which will get removed automatically, and is required to create a folder that has a dot at the beginning).
c:\Users\Administrator\.ssh>ssh-keygen -t rsa -C "myemail@myemail.com"
Generating public/private rsa key pair.
Enter file in which to save the key (/home/Administrator/.ssh/id_rsa): C:\Users\Administrator\.ssh\id_rsa
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in C:\Users\Administrator\.ssh\id_rsa.
Your public key has been saved in C:\Users\Administrator\.ssh\id_rsa.pub.
The key fingerprint is:
... myemail@myemail.com
The key's randomart image is:...`
I know this is an old thread, but I thought the answer might help others.