Full error text:
fatal: unable to access \'https://github.com/Repository_name\': schannel: failed to open CA file \'C:/Users/Username/AppData/Local/GitHubDesktop/ap
The error I got was:
fatal: unable to access 'https://github.com/{reponame}.git/': schannel: failed to open CA file 'C:/Program Files (x86)/Git/mingw64/ssl/certs/ca-bundle.crt': No such process
I fixed it by opening my config file located in "C:\ProgramData\Git\config" and updating the setting as follows sslCAInfo = C:/Program Files/Git/mingw64/ssl/certs/ca-bundle.crt
I hope this helps someone