fix #73

README.md

@@ -55,6 +55,13 @@ Install php dependecies:
 
     composer update
 
+### Troubleshooting
+
+* **IMAP Server has invalid certificate**: You might have to add `novalidate-cert` to the IMAP settings. See flags on http://php.net/manual/en/function.imap-open.php.
+* **Error 500, Internal error**: Check your error log file. Add to `config.php`: 
+
+    ini_set('display_errors', 1);    ini_set('display_startup_errors', 1);    error_reporting(E_ALL);
+
 
 ## Credit :thumbsup: