Help needed regarding an docx upload script error

Hi, I wrote a php script to upload docx, doc , pdf file to the server in abc folder and i want that file to be renamed with the name of uploader with uploading date as prefix. When i run it , it shows me errors in line 13 and 14.Please help me . thanks in advance

define("UPLOAD_DIR", "C:\\wamp\\www\\abc\\""); ///home/mgcons/my_file_uploads
if(!empty($_FILES["uploaded_file"] )){
	if ($myFile["error"] !== UPLOAD_ERR_OK){
		echo "<p>An error occurred.</p>";
		$ab=date("d m Y",$day);
		echo "Unable to save file.";
		chmod(UPLOAD_DIR . $file_name, 644);
	$mime="application/pdf; charset=binary"."application/vnd.openxmlformats-officedocument.wordprocessingml.document"."application/"."application/vnd.openxmlformats-officedocument.wordprocessingml.template"."application/"."application/msword";
	exec("file -bi " . $_FILES["$myFile"]["tmp_name"], $out);
	if($out[0] != $mime){
		echo "File is not supported";
		exec("clamscan --stdout ". $_FILES["$myFile"]["tmp_name"], $out, $return);
		if ($return){
			echo "This file is infected";

can you tell us, what line of code and the error you get?

it gave me these errors