Google the error for your answer.
“Fatal error: Class ‘ACF_WP_Query'”
Moderator
t-p
(@t-p)
to make sure your theme is not the problem, for a moment try switching to the unedited default theme (twenty eleven) by renaming your current theme’s folder in wp-content/themes. The idea is to force WordPress to fall back to the default theme to rule out any theme-specific issue.
If you don’t have access to your admin area, then access your server via FTP or SFTP or whatever file management application your host provides.
Tried the above, looks like it is a problem with the template. I think it occurred after a scheduled update.
If I can change the code on the template or something can someone please let me know what that could be??
Try check whether your theme requires any update or anything that is compatible to your current wordpress version or not.
I’m going to make an absolute stab-in-the-dark. “ACF” is often associated with “Advanced Custom Fields”. By chance, does your Theme use/rely on the Advanced Custom Fields Plugin?
(Looks like class ACF_WP_QUERY is part of this Plugin.)
Try installing/activating (or updating) the Plugin, and see if the fatal error is resolved.