Upgrade frmo 6.17 to 7.22 messed up my web site

Hi,

I have a web site, hosted at godaddycom that I am maintening for a
colleague.

We recently receive an advise saying we should upgrade to the latest
version of Drupal.

I tried yesterday, using the automatic procedure provided by the web
hosting company, but it messed up my web site.

First error was about unexisting function file_directory_path in
sites/all/theme/sky/template.php

I did replace any occurence of file_directory_path by file_default_scheme
in any file I could find. And now my site display "site under
construction".

What can I do next?

Thanks in advance,

Olivier
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