That is Core code trying to use a Core function. You have almost certainly had a problem with the transfer.
- Very carefully, re-upload all of the files. I expect some file is
missing or corrupt. - And make sure that all of your permissions are correct.
It would probably be a good idea to disable plugins and switch to a default theme as well. Since you can’t get into the backend you will need to remove or rename the theme and plugin folders via FTP.
Since you just transfered, I am assuming that you have good backups.
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