There is no error in your site:
By the way, we could not insert the code into your child theme's functions.php file because the file editing in Appearance > Theme Editor is not allowed. All edits must be done manually by downloading/uploading the mentioned file.
Please be very careful in copying and pasting of the code. In most cases, the quotes were no longer correct when pasting the code. This is usually the case for Windows users. Please double check the quotes. It must be
'some text' and
Hope this helps. Please let us know how it goes.