Event Espresso 4 actually will run just fine on 5.6.30, but it’s advised to upgrade to the current version of PHP 5.6 so your server has all of the latest security patches. I’ve removed the part of your post that included the path to your server.
In addition to the above, you should contact your host and ask them to set display_errors to false. Some web hosts will turn that on be default, but error reporting should be turned off for production sites.
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