我已經安裝了wamp服務器,我在標有「調用堆棧」的橙色表格中顯示PHP錯誤。 我有以下錯誤:PHP'調用堆棧'錯誤 - 未知原因
Notice: A session had already been started - ignoring session_start() in C:\wamp\www\followup\database\db_conn.php on line 2
Call Stack
# Time Memory Function Location
1 0.0007 377872 {main}() ..\index.php:0
2 0.0127 399168 include('C:\wamp\www\followup\admin_header.php') ..\index.php:15
3 0.0129 402792 include('C:\wamp\www\followup\database\db_conn.php') ..\admin_header.php:2
4 0.0129 402824 session_start () ..\db_conn.php:2
請幫我在我的代碼刪除此錯誤。