Composer Error – Error at zones: 6(models) : 0(dom). 500 internal server error.

Hi,
We just added a global header template to our home page via the manager in the tagDiv composer.

Suddenly after saving we are getting this error: Server Error
500
Internal Server Error

in tag div composer.

The website is working fine but when we try to goto to tagDiv composer for the home page.
it shows this error (screenshot attached)

https://prnt.sc/WFScuVm8PJfl

How do we resolve this?

Thanks
website: http://www.gadgetbridge.com

Found the annswer on Plest forums.

To fix the issue, try to add the following lines in Domains >domain.com > Apache & nginx Settings > Additional directives for HTTP:

<IfModule mod_security2.c>
SecResponseBodyLimit 546870912
</IfModule>

And press apply.