I am getting Ajax error messages intermittently on some of our tables. I've followed the instructions here and it seems to be a 504 error. 

https://datatables.net/manual/tech-notes/7

In the instructions it mentions 500, but not 504. I've checked the server logs and nothing is coming up. I've attached them anyway. 
Please advise - it's a very bad user experience.
Some pages we get this error are
https://www.superguide.com.au/retirement-planning/reckoner-discover-preservation-age-and-age-pension-age

https://www.superguide.com.au/boost-your-superannuation/monthly-superannuation-returns-performance-reckoner-investment-options

https://www.superguide.com.au/boost-your-superannuation/asset-class-performance-reckoner-investment-returns

If the fix is to add this code below. How do I add it?
$.fn.dataTable.ext.errMode = 'throw';

Thanks Milan - But here are screenshots to show it is happening. These are in latest Chrome on latest OSX.

Please try refreshing. It happens perhaps 25% or more of the time.

Cheers, Rob

Hi Milan - OK. We cannot see it now and so it may be that an update from another plugin fixed it. We'll keep an eye on it and let you know if we see it again.

Cheers, Rob

Hi Milan - We are seeing it again. Here are examples in Safari (see attachments).

https://www.superguide.com.au/boost-your-superannuation/monthly-superannuation-returns-performance-reckoner-investment-options

https://www.superguide.com.au/boost-your-superannuation/superannuation-investment-performance-reckoner-discover-annual-returns-investment-options

This is happening in private/incognito windows, so it is not a caching issue.

Cheers, Rob

We are also getting this error in admin. Please see the screenshot.

It is urgent that we have a fix for this, or a workaround. We send out our monthly newsletter tomorrow and so potentially 30,000 subscribers could be getting these errors.

We are also getting a 504 error when trying to save. Please see screenshot.

Hi - Because of the last error I followed up with our host (WP Engine) because the error said it could have been a gateway timeout issue. 

They have now moved us to a different server and the errors are currently not happening. 

Could this have been the reason for these errors?

Cheers, Rob

OK thanks Milan

Hi - We are getting this error again. Last time it was resolved because our host (WP Engine) moved us to a new server because we had a 'noisy neighbour' that was causing the timeouts. This time we have checked though and they said there are no issues like that this time.

You can see this error on any of our pages with tables - eg

https://www.superguide.com.au/boost-your-superannuation/superguide-retirement-reckoner

https://www.superguide.com.au/boost-your-superannuation/superguide-much-super-enough-reckoner

https://www.superguide.com.au/retirement-planning/reckoner-discover-preservation-age-and-age-pension-age

Please advise how this can be fixed. We cannot see any timeout issues on our side. 

If there is no easy fix, I noticed on this page it says

"If you are willing to accept the error (for example if you cannot alter the backend system to fix the error), but don't want your end users to see the alert() message, you can change DataTables' error reporting mechanism to throw a Javascript error to the browser's console, rather than alerting it. This can be done using..."

Please can you advise, is this javascript ($.fn.dataTable.ext.errMode = 'throw';) something that we can add through the wpdatatables admin, or is there another method that you recommend that we should use to add this code?

Cheers, Rob

Hi Milan - Many thanks. FYI we were able to identify that it was this plugin - https://ampforwp.com/opt-in-forms/

When we deactivate that the error no longer happens so we are liaising with the developer about how to fix.

Cheers, Rob