Craigslist won't let me post?

Ok, so. My computer is not working so for the past month I've been selling a lot of my old things through Craigslist. I have The Craigslist iPhone app & it says Network Correction error, please make sure the clock is set correctly. So I thought there was a problem with the app, I downloaded another Craigslist app & it won't let me
log in.

Try after deleting cache and temporary files…