Error in move_uploaded_file when file uploading

Hello
I am using formit to upload image to server and create resource.
In formit2resource, I checked image file was uploaded in formit temp folder.
But, when move file to destination by move_uploaded_file function, an error was occured and temp image in temp folder was not moved.
I am a beginner on MODx, so I hope if someone can help me.

here is my formit2resource code.

<?php
$doc = $modx->getObject('modResource',array('id'=>$hook->getValue('resource_id')));
 
if (empty($doc)){
    $doc = $modx->newObject('modResource');
    $doc->set('createdby', $modx->user->get('id'));
}
else{
    $doc->set('editedby', $modx->user->get('id'));
}
 
$allFormFields = $hook->getValues(); 

 $modx->log(MODx::LOG_LEVEL_ERROR, 'all form fields'.print_r($allFormFields,true));

foreach ($allFormFields as $field=>$value)
{
 
   if ($field !== 'spam' && $field !== 'resource_id'){
         $doc->set($field, $value);
    }
}
 
 
$doc->set('template', '1');
$doc->save();
 
foreach ($allFormFields as $field=>$value)
{
    if ($tv = $modx->getObject('modTemplateVar', array ('name'=>$field)))
    {
        /* handles checkboxes & multiple selects elements */
        if (is_array($value)) {
            $featureInsert = array();
            while (list($featureValue, $featureItem) = each($value)) {
                $featureInsert[count($featureInsert)] = $featureItem;
            }
            $value = implode('||',$featureInsert);
        }   
        //$modx->log(MODx::LOG_LEVEL_ERROR, 'array value-'.$doc->get('id').'-'.$value);
        
        $tv->setValue($doc->get('id'), $value);
        $tv->save();
    }
}
 

//$modx->log(modX::LOG_LEVEL_ERROR,'Start of script-');
// initialize output;
$output = true;
// get the current user name to for dicroty placement
$userName = $modx->user->get('username');
 
// valid extensions
$ext_array = array('jpg', 'jpeg', 'gif', 'png');
 
// create unique path for this form submission
$uploadpath = 'assets/userfiles/trash/';
//$uploadpath = 'idt-mdv1-y/assets/images/trash/' . $userName .'/';

// get full path to unique folder
$target_path = $modx->config['base_path'] . $uploadpath;
 
// get uploaded file names:
$submittedfiles = array_keys($_FILES);

//get exsisting user profile data for Profile_Photos
//$fields = $modx->user->getOne('Profile')->get('extended');
//$Photo_fields = $fields['trashimage'];
 
// loop through files
foreach ($submittedfiles as $sf) {
 
    // Get Filename and make sure its good.
    $filename = basename( $_FILES[$sf]['name'] );
    
    // Get file's extension
    $ext = pathinfo($filename, PATHINFO_EXTENSION);
    $ext = mb_strtolower($ext); // case insensitive
    
    if($filename != '') {
      
        // is this the right type of file?
        if(in_array($ext, $ext_array)) {
        
            //create file called the filename that has been sanitized
            $filename = strtolower(preg_replace("/[^A-Za-z0-9.]+/i", "-", $filename));
            
            // full path to new file
            $myTarget = $target_path . $filename;
            
            // temp file name
            $tempname = $_FILES[$sf]['tmp_name'];
            $modx->log(MODx::LOG_LEVEL_ERROR, 'temp name-'.$tempname);
            $modx->log(MODx::LOG_LEVEL_ERROR, 'target path-'.$myTarget);
            
			//URL path
			$urlPath = $uploadpath . $filename;
            $modx->log(MODx::LOG_LEVEL_ERROR, 'url path-'.$urlPath);
            
            // create directory to move file into if it doesn't exist
            if(!is_dir($target_path)){
                mkdir($target_path, 0755, true);
                $modx->log(MODx::LOG_LEVEL_ERROR, 'folder create');
            }
            
            if(file_exists($myTarget)) {
                chmod($myTarget,0755); //Change the file permissions if allowed
                unlink($myTarget); //remove the file
                $modx->log(MODx::LOG_LEVEL_ERROR, 'file delete');
            }
            
            // is the file moved to the proper folder successfully?
            if(move_uploaded_file($tempname, $myTarget)) {
        
                 $modx->log(MODx::LOG_LEVEL_ERROR, 'file moved');
                
                // $hook->setValue($sf, $uploadpath . $filename);
                // $modx->setPlaceholder($sf, $urlPath);
                
                // place file path to TV
                // if (!$doc->setTVValue($sf, $urlPath)) $modx->log(MODx::LOG_LEVEL_ERROR, 'Upload:Saving TV error');
                
                $tv = $modx->getObject('modTemplateVar', array ('name'=>'trashimage'));
                $tv->setValue($doc->get('id'), $urlPath);
                $tv->save();
                
                // set the permissions on the file
                if (!chmod($myTarget, 0644)) { /*some debug function*/ }  
                
            } else {
                // File not uploaded
                $errorMsg = 'There was a problem uploading the file.';
                $hook->addError($sf, $errorMsg);
                $output = false; // generate submission error
            }
        } 
        else {
            // File type not allowed
            $errorMsg = 'Type of file not allowed.';
            $hook->addError($sf, $errorMsg);
            $output = false; // generate submission error
        }
    
    } // if no file, don't error, but return blank
    else {
    
        // is the file name empty (no file uploaded) and exsiting photofields empty
        $hook->setValue($sf, '');
        $hook->addError($sf, 'no file uploaded');
        $doc->setTVValue($sf, '');      // insert empty value to TV
    }
}

$doc->save();

return $output;