Hello @Kangarooo the error is telling you that it cannot find the following directory or file
And the error can be traced on the following path:
functions.php on line 1001
You also have to understand that you went from version 3.5.6 or something to the latest version 4.4.6. There were many versions between your old installation and the new installation. I am amazed that it went as smooth as it did. In some cases it could have crashed the website. That is because there were too many versions in between.
Please keep in mind that Sayontan keeps updating the theme regularly and it would be in your best interest to keep up to date with the updates to have a healthy and secure theme.
I hope this helps you.
If this answers your question and you are satisfied could you please close this thread as resolved.
Kind and warm regards