我在访问文件时收到此错误
致命错误：在
中的布尔值上调用成员函数fetch_field（） 第78行的/home/kdcuqjap/public_html/dbhelper.php
，从第78行开始的代码是
while ($field = $meta->fetch_field()) {
//get the name of the current column
$var = $field->name;
$$var = null;
//set column key and its value as a reference
$columns[$var] = &$$var;
}