PHPExcel致命错误:在非对象上调用成员函数put(）

我最近把我的网站从一个共享托管帐户转移到了一个VPS，我提到了这个VPS，因为我认为它可能与此有关。无论如何，我正在使用PHPExcelhttps://phpexcel.codeplex.com生成一个excel表，其中包含从mysql表中提取的内容。该脚本在共享托管帐户上运行良好，但现在突然不起作用，而是显示一个错误，上面写着致命错误：在非对象上调用成员函数put（），它引用的文件和行号看起来像下面的

$user->put($dateProcessed, $amount);

   //below is the code for the page
/**
 * @author Gary Drocella
 * @date 01/10/2014
 * Description: Performs data mining and generates a spread sheet from database.
 */
    $todaydate = date('Y-m-d');
require_once '/home/***/public_html/reports/User.php';
require_once '/home/****/public_html/reports/SpreadsheetGenerator.php';
$dbh = Connection::getConnection();
mysql_select_db("*****", $dbh);

$resultSet = mysql_query("SELECT sys_userprofiles.uid, sys_userprofiles.f_name, 
                              sys_userprofiles.l_name,  sys_userprofiles.acctstatus_id,
                              sys_userlogins.acct_status 
                              FROM sys_userprofiles, sys_userlogins WHERE 
                              sys_userprofiles.acctstatus_id NOT IN(0, 11, 23, 26, 28, 
                              30) AND sys_userprofiles.uid = sys_userlogins.uid AND 
                              sys_userlogins.acct_status = 'active' AND  
                              sys_userlogins.u_level = 2", $dbh);
$userTable = array();
/* Create a user Table */
while($row =mysql_fetch_row($resultSet)) {
    $uid = $row[0];
    $fName = $row[1];
    $lName = $row[2];
    $currUser = new User($uid, $fName, $lName);
    $userTable[$uid] = $currUser;
}
/* Populate user (date,amount) maps */
$resultSet = mysql_query("SELECT DISTINCT uid, str_to_date(paymentdate, '%Y-%m-%d') AS date_processed, SUM(amount) AS total
                          FROM sys_userpayschedule WHERE uid IN (SELECT uid FROM sys_userlogins WHERE acct_status = 'active' AND u_level = 2) 
                          AND str_to_date(paymentdate, '%Y-%m-%d') >= curdate() AND str_to_date(paymentdate, '%Y-%m-%d') <= DATE_ADD(curdate(), interval 6 MONTH) 
                          GROUP BY date_processed, uid ORDER BY date_processed", $dbh);
while($row=mysql_fetch_row($resultSet)) {
    $uid = $row[0];
    $dateProcessed = $row[1];
    $amount = $row[2];
    $user = $userTable[$uid];
    $user->put($dateProcessed, $amount);
}
$spreadSheetGen = new SpreadsheetGenerator();
$spreadSheetGen->generate($userTable);

再次，除了将所有文件从共享托管帐户移动到VPS之外，我没有做任何更改。所以我想知道他们是否是我可能需要安装的某种服务器端模块，这是共享托管帐户上的标准模块，以使其发挥作用？我仔细检查了所有文件是否都已移动，是否位于正确的位置，以匹配共享托管帐户上的内容。如果需要的话，我可以发布完整的页面代码。

有什么建议吗？？

如果我执行var_dump（$user）；从我的第二个查询中，我得到了一个输出，其中包含urserid和名称，但我认为只有一行左右的异常下面是$user 的var_dump

object(User)#240 (5) { ["uid":"User":private]=> string(5) "10489" ["firstName":"User":private]=> string(5) "Helen" ["lastName":"User":private]=> string(12) "Throckmorton" ["dateTotalTable":"User":private]=> NULL ["dateTable"]=> array(0) { } } object(User)#258 (5) { ["uid":"User":private]=> string(5) "10516" ["firstName":"User":private]=> string(7) "Russell" ["lastName":"User":private]=> string(8) "Demedina" ["dateTotalTable":"User":private]=> NULL ["dateTable"]=> array(0) { } } object(User)#2269 (5) { ["uid":"User":private]=> string(5) "13201" ["firstName":"User":private]=> string(7) "Orlando" ["lastName":"User":private]=> string(14) "Lewis-Maryland" ["dateTotalTable":"User":private]=> NULL ["dateTable"]=> array(0) { } } object(User)#2270 (5) { ["uid":"User":private]=> string(5) "13203" ["firstName":"User":private]=> string(17) "Latrinda S" ["lastName":"User":private]=> string(5) "Clark" ["dateTotalTable":"User":private]=> NULL ["dateTable"]=> array(0) { } } NULL