Pricing Modules won't save across the site

As the title states, I can’t make changes to the pricing modules on my site, clicking save just hangs. in the network tab I get a error 500. I haven’t tried disabling plugins as this is a live site and would rather not take it’s functionality down if possible. Thanks,

Have a look in your error logs, php will have logged the fatal error.

There are a few warnings about an old plugin that I cleared up but I suspect this error.

mod_fcgid: stderr: PHP Warning: Parameter 2 to WPE\Site_Preview::the_posts() expected to be a reference, value given in /home/USER/ on line 287

What do you think would cause that?

Okay update I found that I had forgotten to close <?PHP tag, all fixed

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