IIIF Toolkit with Mirador

I installed this plugin to my Omeka site hosted a Linux virtual host, and as soon as I activated this Omeka plugin, the site became unreachable: (Blank page)…
I checked /var/log/httpd/error.log and getting quite a frew PHP Fatal errors.
Can someone please suggest how to resolve this.
I’m on a Redhat 6.9 virtual host running Omeka version 2.5. I tried to get this plugin to work on 2.4.1 and still get PHP fatal errors

[Mon Jul 17 11:57:46 2017] [notice] Digest: done
[Mon Jul 17 11:57:46 2017] [notice] Apache/2.2.15 (Unix) DAV/2 PHP/5.4.45 configured – resuming normal operations
[Mon Jul 17 12:00:09 2017] [error] [client 150.108.20.100] PHP Fatal error: Can’t use function return value in write context in /var/www/html/omeka_casm/plugins/IiifItems/libraries/IiifItems/Integration/Items.php on line 311, referer: https://omekacasm.site.edu/admin/plugins
[Mon Jul 17 12:00:13 2017] [error] [client 150.108.20.100] PHP Fatal error: Can’t use function return value in write context in /var/www/html/omeka_casm/plugins/IiifItems/libraries/IiifItems/Integration/Items.php on line 311, referer: https://omekacasm.site.edu/admin/plugins
[Mon Jul 17 12:00:16 2017] [error] [client 150.108.20.100] PHP Fatal error: Can’t use function return value in write context in /var/www/html/omeka_casm/plugins/IiifItems/libraries/IiifItems/Integration/Items.php on line 311, referer: https://omekacasm.site.edu/admin/users/login

It looks like that plugin uses a construct that only works in PHP 5.5 and higher.

I was about to suggest that you report this to the plugin’s developers, but it looks like you’ve done that and things seem to be on the right track there.