This might sound dumb, but double-check your date/time settings. Had the craigslist postings ap fatal error connecting to craigslist thing and my phone’s clock was off by like 2 hours. Fixed it and no more errors.
Also, try posting at a different time—Craigslist’s servers can be weird during peak hours.
Also, try posting at a different time—Craigslist’s servers can be weird during peak hours.