致命错误：未捕获的Google_Service_Exception：{“ error”：{“ code”：400，“ message”：“接收到无效的JSON有效负载。未知名称\” name \“

Question

我经常尝试将数据附加到我的Google工作表中。大多数情况下，我会收到错误消息。我在Google上进行了搜索，并找到了解决该错误的几种可能方法。由于代码过时，大多数建议的解决方案对我来说都不起作用。不幸的是，我一直无法解决该错误。

这是我的代码：

<?php
require __DIR__ . '/vendor/autoload.php';


define('SCOPES', implode(' ', array(
    Google_Service_Sheets::SPREADSHEETS,
    Google_Service_Sheets::DRIVE,
    Google_Service_Sheets::DRIVE_FILE) 
));
/**
 * Returns an authorized API client.
 * @return Google_Client the authorized client object
 */

function getClient() {
    $client = new Google_Client();
    $client->setAuthConfig('credentials.json');
    $client->setApplicationName('theName');
    $client->setScopes(SCOPES);
    return $client;
}

// Get the API client and construct the service object.
$client = getClient();
$service = new Google_Service_Sheets($client);

// Prints the names and majors of students in a sample spreadsheet:
// https://docs.google.com/spreadsheets/d/1BxiMVs0XRA5nFMdKvBdBZjgmUUqptlbs74OgvE2upms/edit
$spreadsheetId = '1wAxarp4q9yo7kUUMaA3RudgmSTab53Dc9fReSbyreeM';
$range = 'Sheet1!A1:Z';

// $post = filter_input_array(INPUT_POST, FILTER_SANITIZE_STRING); 

$firstName = "Mamunur";
$roll = "5200";
$class = "class";

$values = [
    'Name'         => $firstName,
    'Roll'          => $roll,
    'Class'      => $class,
    'Dev'           =>"dev"
];
$requestBody = new Google_Service_Sheets_ValueRange([
    'values' => [$values]
]);

$params = [
    'valueInputOption' => 'ROW'
];


$result = $service->spreadsheets_values->append($spreadsheetId, $range, $requestBody, $params);
printf("%d cells appended.", $result->getUpdates()->getUpdatedCells());