Pro 2.3.8 the preview could not load, only home page and global blocks

[ERES]

Hey guys,

on certain pages I get the error “the preview could not load…”. I dont have any caching active. In the console there is a 500 error. Do you know what the problem is?

Thanks and best!

[ruenel]

Hello @RSMG,

Thanks for writing in! I have checked your site and I can confirm that there is an error 500 in the console. In most case, an error 500 is a fatal error which can be caused by PHP memory exhaustion or by a PHP error. ​We recommend that you increase your memory allocated to PHP. To increase it, please edit your wp-config.php file and insert these lines:

define( 'WP_MEMORY_LIMIT', '256M' );
define( 'WP_MAX_MEMORY_LIMIT', '512M' );

You can add it before the line
/*That's all, stop editing! Happy Blogging. */

If the error still exist, then it must be a PHP error which we do not know yet. You will need to enabled the debug mode. You can do this by opening wp-config.php and adding

define('WP_DEBUG', true);

/* That's all, stop editing! Happy blogging. */

When you revisit the page, you should have some error output describing the issue in more detail.

We would loved to know if this has work for you. Thank you.

[ERES]

Hello and thank you for your fast answer! The increased memory limit did not solved the problem but I found some errors in the error log about “ModSecurity”. I asked now the server operator to increase these limits.

[paul.r]

Hi,

Please let us know how it goes.

Thanks

[ERES]

Error fixed, it was something with mod_security and a file limit. He increased it and now everything is fine again.
Thank you guys!

[friech]

You’re more than welcome, glad we could help.

Cheers!