Website is not opening

Hello Team,
I am observing since last 20 days, my site is not opening in one time. always i need to refresh the page more than three times, then the website is open. but since yesterday site is not opening.
could you please check at your end why it is not opening.
regards,
Mohit 

What’s the domain that has this problem?

onlinenetworkdata.com

Can you please clarify what “not opening” means for you? Do you see any error page? Could you show a screenshot of what you see instead?

my Website page is not opening.
that is the problem, i do not see any error on the page progress bar has been completed and nothing shows on the page.



the erro is showing given below



This page isn’t working

onlinenetworkdata.com is currently unable to handle this request.

HTTP ERROR 500

please enable error reporting https://infinityfree.net/support/http-error-500/

this is showing this error


Warning: require_once(includes/class-functions.php): failed to open stream: No such file or directory in /home/vol6_1/epizy.com/epiz_21516689/htdocs/wp-content/plugins/ultimate-member/ultimate-member.php on line 24

Fatal error: require_once(): Failed opening required ‘includes/class-functions.php’ (include_path=‘.:/usr/share/pear/’) in /home/vol6_1/epizy.com/epiz_21516689/htdocs/wp-content/plugins/ultimate-member/ultimate-member.php on line 24

hey thanks,
i have deleted a plugin which was creating a problem. now my site is functional.

thanks for your help