Update: My IT guy fixed the problem. here is what he said….
“I fixed the error on your site. There is an error in the Velocity plugin. I commented out the following line and the site started working.
#if(empty(trim($wp_styles->registered[$handle]->src))) { continue; } # skip empty src”
Update: Once I got back in to my wordpress dashboard I see that you now have a newer (1.1.9) version that “fixed a fatal error on certain php configurations” That must have been the error I got with your 1.1.8 version.
Which php version are you using on your site?
Can you install this: https://wordpress.org/plugins/version-info/
And then copy here the info on the footer?
(And then you can remove the plugin)
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This would happen on older than PHP 5.5 versions…
Please tell your sysadmin to upgrade PHP as for each version you upgrade, it becomes much faster.
I have improved compatibility with older versions and it fixes this error, but bare in mind that I only officially provide “support” to PHP 5.6+ and above (as stated on the readme file).