Hi @Seminar466,
Welcome to the community forum!
Can you show us screenshots? OSX 10.8 is significantly out of date - the last update, 10.8.5, came out in 2013. Barring everything else, you should at least update to that patch level. https://support.apple.com/en-us/HT202785
Can you show us file information too?
ls -al *.pem