Dostlar bir sitemiz var sorunsuz çalışıyordu lakin bi hosting değişti site sapıttı

[23-Feb-2021 17:25:02 UTC] PHP Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /home/mevlanagumus/public_html/yonetim/adminislem.php:3) in /home/mevlanagumus/public_html/inc/baglan.php on line 3

[23-Feb-2021 17:25:36 UTC] PHP Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /home/mevlanagumus/public_html/yonetim/adminislem.php:3) in /home/mevlanagumus/public_html/inc/baglan.php on line 3

[23-Feb-2021 20:25:36 Europe/Istanbul] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/mevlanagumus/public_html/yonetim/adminislem.php:3) in /home/mevlanagumus/public_html/yonetim/adminislem.php on line 40

ne yaptıysam çözemedim yardımcı olabilecek varsa çok mutlu olurum