Error Failed loading publishing 'ZendGuardloader.so' "opcache.so'

Here is the error code I get when I publish articles. Specifically I publish some articles using Republish and it’s plugin for WordPress. I suspect the problem is the plugin itself. I have gotten considerable errors and the site went down.

here is the error:
=====================Being Error code===|
[Mon Mar 14 10:35:09 2016] [error] [client 65.100.94.174] Failed loading /usr/php/56/usr/lib64/php/modules/ZendGuardLoader.so: /usr/php/56/usr/lib64/php/modules/ZendGuardLoader.so: undefined symbol: zend_new_interned_string, referer: http://www.warn-usa.com/wp-admin/edit.php?page=repubhub-republish
[Mon Mar 14 10:35:09 2016] [error] [client 65.100.94.174] Failed loading /usr/php/56/usr/lib64/php/modules/opcache.so: /usr/php/56/usr/lib64/php/modules/opcache.so: undefined symbol: zend_new_interned_string, referer: http://www.warn-usa.com/wp-admin/edit.php?page=repubhub-republish
=====================End Error code===|

Please advise as to your thoughts on this!
Thanks,