Php not updating word document

Question

I had created an automation system with php which takes information straight from a contact form on my website and fills in the information into a word template contract and sends me the contract with the filled in information.

After running the code this is error message

Warning: ZipArchive::close(): Failure to create temporary file: Permission denied i

how do I fix this?

       if (!file_exists($folder))
    {
        mkdir($folder);
    }       
         
    //Copy the Template file to the Result Directory
    copy($template_file_name, $full_path);
 
    // add calss Zip Archive
    $zip_val = new ZipArchive;
$fill_1 = (string) $_POST["name_1"];
$fill_2 = (string) $_POST["surname_1"];
$fill_3 = (string) $_POST["name_2"];
$fill_4 = (string) $_POST["surname_2"];
$fill_5 = (string) $_POST["id_number_1"];
$fill_6 = (string) $_POST["id_number_2"];
$fill_7 = (string) $_POST["valofestate_1"];
$fill_8 = (string) $_POST["valofestate_2"];
    //Docx file is nothing but a zip file. Open this Zip File
    if($zip_val->open($full_path) == true)
    {
        // In the Open XML Wordprocessing format content is stored.
        // In the document.xml file located in the word directory.
         
        $key_file_name = 'word/document.xml';
        $message = $zip_val->getFromName($key_file_name);                
                     
        $timestamp = date('d-M-Y H:i:s');
         
        // this data Replace the placeholders with actual values
        $message = str_replace("token1", " $fill_1",       $message);
        $message = str_replace("token2", " $fill_2",           $message);
        $message = str_replace("Token3", " $fill_3",                  $message);      
        $message = str_replace("token4", " $fill_4",           $message); 
        $message = str_replace("token5", " $fill_5",       $message);
        $message = str_replace("token6", " $fill_6",           $message);
        $message = str_replace("token7", " $fill_7",                  $message);      
        $message = str_replace("token8", " $fill_8",           $message); 
         
        //Replace the content with the new content created above.
        $zip_val->addFromString($key_file_name, $message);
        $zip_val->close();
    }
}
catch (Exception $exc) 
{
    $error_message =  "Error creating the Word Document";
    var_dump($exc);
};