I have been smashing my head for a while and all the solutions I found on internet didn't help. Finally i did that:
tail -n 20 /Applications/MAMP/logs/php_error.log
You might have a typo... :P
I hope it helps
For me was to revert the port to 8888. Was following a tutorial sying to change the default port to 80. By reverting to the default one it worked.
Posting anyway in case someone lands here after 4 years.