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Warning: Undefined array key "id" in /home/sandelz/public_html/backend-apps/Adminmain/convert_invoicemainretail.php on line 29

Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, bool given in /home/sandelz/public_html/backend-apps/Adminmain/convert_invoicemainretail.php:71 Stack trace: #0 /home/sandelz/public_html/backend-apps/Adminmain/convert_invoicemainretail.php(71): mysqli_query(false, 'UPDATE retail_o...') #1 {main} thrown in /home/sandelz/public_html/backend-apps/Adminmain/convert_invoicemainretail.php on line 71