Permissions

Please carefully:

1. Issue 755 permission to the folder where you've uploaded the code
2. Issue 644 permission to the PHP file which you've uploaded.
3. Test your URL again.

If still, it doesn't work then:

Issue 775 permission to the folder where you've uploaded the code.

If all fails finally, issue 777 permission to the folder where you've uploaded the code.

If you are using WinSCP: