ERR_HTTP2_PROTOCOL_ERROR - wordpress

I am facing this issue since this morning in one of my wordpress site, whenever i publish the post from wordpress, i am getting following error message


The webpage at https://www.deptnews.in/wp-admin/post.php might be temporarily down or it may have moved permanently to a new web address.

ERR_HTTP2_PROTOCOL_ERROR

I tried without cloudflare DNS,where it was working fine, but using cloudflare DNS i am facing the above mentioned issue.

Please help - its very urgent

Thanks

That URL works for me:

The site is working fine, but problem is intermittent. yesterday i got this message very frequently, did not check today, will check and let you know

But what is the meaning for this error message ? ERR_HTTP2_PROTOCOL_ERROR

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