Click on the first page

Question

Why does an error appear when clicking the first page? Warning: mysql_fetch_row() expects parameter 1 to be resource, boolean given in E:\www\wamp\www\studentSystem\AdminB\article-list.php on line 72 , Warning: mysql_free_result() expects parameter 1 to be resource, boolean given in E:\www\wamp\www\studentSystem\AdminB\article-list.php on line 93 No error will be reported when clicking the next page

Answer 1

Tell me which page is the previous page of the first page