Cannot modify header information - headers already sent by
I have an insert data php page that has been working fine for a year, hosted at GoDaddy Recently the ssl certificate updated and I had problems with only this website on my server. The website its self works fine, but I have an admin section for uploading data to MySql database. After the data is entered and submitted, the goto page is supposed to be: https://3dsound.org/protected/Event_Calendar_results.php I have the correct goto page listed in the php coding, but it goes back to a blank screen on this URL: https://3dsound.org/protected/Event_Calendar_insert.php If I highlight the url in the address bar and then hit my enter key the page insert page will come back up, Data is getting entered into the database OK.
I checked the error logs on the server and it shows this:
[16-Jan-2022 13:51:30 UTC] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/mississippi5/public_html/3dsound.org/protected/Event_Calendar_insert.php:1) in /home/mississippi5/public_html/3dsound.org/webassist/mysqli/queryobj.php on line 688
I don't know if it is a server problem or something on my site. I did upload a backup copy of the file and got the same results,
Thanks for your help