xlsx not readable in wordpress

[eloyfernandes]

Hi, I'm developing a Wordpress plugin where I need to upload xlsx files, but after i upload the file and I try to open it there's an error,

SpreadsheetReader: File (C:/xampp/htdocs/127.0.0.1/wp-content/uploads/2019/04/KDP.xlsx) not readable

This is what I'm doing:

            if(isset($_FILES['test_upload_pdf'])){
                $pdf = $_FILES['test_upload_pdf'];

                $uploaded=media_handle_upload('test_upload_pdf', 0);

                if(is_wp_error($uploaded)){
                        echo "Error uploading file: " . $uploaded->get_error_message();
                }else{
                    $year = date('Y');
                    $month = date('m');
                    $targetPath = get_site_url()."/wp-content/uploads/".$year."/".$month."/".$_FILES['test_upload_pdf']['name'];
                    $targetPath2 = $_SERVER['DOCUMENT_ROOT']."/".$_SERVER["HTTP_HOST"]."/wp-content/uploads/".$year."/".$month."/".$_FILES['test_upload_pdf']['name'];
                    try
                    {
                        $Reader = new SpreadsheetReader($targetPath2);
                    }
                    catch (Exception $E)
                    {
                        echo $E -> getMessage();
                    }
                }
            }

I've tried with

get_site_url // using this i get http://127.0.0.1/wordpress/wp-content/uploads/2019/04/example.xlsx

and

$_SERVER['DOCUMENT_ROOT']."/".$_SERVER["HTTP_HOST"] // With this one i get this: C:/xampp/htdocs/127.0.0.1/wp-content/uploads/2019/04/KDP.xlsx

But I always get the error message above mentioned.

What can i do?