Admin / Settings / Backup. Unable to load settings page.

Hi,

I'm experiencing an issue where I can not load the backup page to enter my settings?

From within perch admin, Settings / Backup. I click the backup link, and the site loads a blank page. The site is trying to load /perch/core/settings/backup/edit/

    Perch Runway: 3.1.1, PHP: 7.0.31, MySQL: mysqlnd 5.0.12-dev - 20150407 - $Id: b5c5906d452ec590732a93b051f3827e02749b83 $, with PDO
    Server OS: Linux, cgi-fcgi
    Installed apps: content (3.1.1), assets (3.1.1), categories (3.1.1), perch_blog (5.6.1), perch_forms (1.11), chirp_seo (1.3.0), perch_mailchimp (3.1)
    App runtimes: <?php $apps_list = [ 'perch_blog', 'perch_mailchimp', 'perch_forms', 'chirp_seo', ];
    PERCH_LOGINPATH: /perch
    PERCH_PATH: /var/www/vhosts/stokesleyshow.co.uk/httpdocs/perch
    PERCH_CORE: /var/www/vhosts/stokesleyshow.co.uk/httpdocs/perch/core
    PERCH_RESFILEPATH: /var/www/vhosts/stokesleyshow.co.uk/httpdocs/perch/resources
    Image manipulation: GD Imagick
    PHP limits: Max upload 8M, Max POST 32M, Memory: 256M, Total max file upload: 8M
    F1: 3b606135b33e6a102526838f4152a807
    Resource folder writeable: Yes
    SCRIPT_NAME: /perch/core/settings/diagnostics/index.php
    REQUEST_URI: /perch/core/settings/diagnostics/
    DOCUMENT_ROOT: /var/www/vhosts/stokesleyshow.co.uk/httpdocs
    HTTP_HOST: stokesleyshow.co.uk

The server is reporting:

GET /perch/core/settings/backup/edit/ HTTP/1.0    https://stokesleyshow.co.uk/perch/core/settings/diagnostics/?extended    Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:62.0) Gecko/20100101 Firefox/62.0    555

mod_fcgid: stderr: PHP Parse error: syntax error, unexpected '=', expecting ']' in /var/www/vhosts/stokesleyshow.co.uk/httpdocs/perch/core/runway/apps/perch_s3/lib/aws/aws-sdk-php/src/data/s3/2006-03-01/api-2.json.php on line 3, referer: https://stokesleyshow.co.uk/perch/core/settings/diagnostics/?extended