core_course_duplicate_course (Web Service)

Dear members and seniors

May you all live in peace!

Today, while working with core_course_duplicate_course (web service). I am error given below.

"Notice: Array to string conversion in moodle\bpms\lib\filelib.php on line 3000
invalidparameter Invalid parameter value detected options => Invalid parameter value detected: Only arrays accepted. The bad value is: 'Array'"

My Code is here in below:-

require_once( '../../../lib/zend/Zend/Http/Client/Adapter/Curl.php' );

define( "MOODLE_URL", "http://localhost/bpms/" );

define( "TOKEN_FOR_BUILT_IN_FUNCTIONS", '1e5deac8a0ba32dc542ad7add11df5' );

$params = array(
'courseid' => 4,
'fullname' => 'core_course_duplicate_course test', // New course full name
'shortname' => 'core_course_duplicate_course', // New course shortname
'categoryid' => 1, // New course category id
'visible' => 1, // Make the course visible after duplicating
'options' => array( array('name'=>'blocks', 'value'=>0)
, array('name'=>'activities', 'value'=>1)
, array('name'=>'filters', 'value'=>0)
, array('name'=>'users', 'value'=>0)
, array('name'=>'userscompletion', 'value'=>0)
, array('name'=>'grade_histories', 'value'=>0)
) // Backup options
);

$function_name = 'core_course_duplicate_course';

$token = TOKEN_FOR_BUILT_IN_FUNCTIONS;

$serverurl = MOODLE_URL . '/webservice/rest/server.php'. '?wstoken=' . $token . '&wsfunction=' . $function_name;

$curl = new curl;

$response = $curl->post( $serverurl, $params );

echo $response;

I am using core_course_duplicate_course  (Web Service) with stable Moodle 2.3. version. I applied all changes, roles, user token, web service use procedure. All done.

bt why this error occur.

filelib.php code from 2977 to 3003 lines

curl_setopt($curl, CURLOPT_HEADERFUNCTION, array(&$this,'formatHeader'));
// set headers
if (empty($this->header)){
$this->setHeader(array(
'User-Agent: MoodleBot/1.0',
'Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7',
'Connection: keep-alive'
));
}
curl_setopt($curl, CURLOPT_HTTPHEADER, $this->header);

if ($this->debug){
echo '<h1>Options</h1>';
var_dump($this->options);
echo '<h1>Header</h1>';
var_dump($this->header);
}

// set options
foreach($this->options as $name => $val) {
if (is_string($name)) {
$name = constant(strtoupper($name));
}
curl_setopt($curl, $name, $val);
}
return $curl;
}

Waiting for your positive response.