Changed domain name but still same server and database. Today we get this message

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Zenphoto has detected a change in your installation.

Zenphoto 1.4.8[3e3fac42b5] has been copied over an unknown release.

The change detected is critical. You must run setup for your site to function.

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and then when clicking the setup link in the message we get the following message:

Fatal error: Call to undefined function zp_loggedin() in /gallery path/galleryzp/zp-core/reconfigure.php on line 110

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line 110 is:

if (!empty($found) && $auto && zp_loggedin(ADMIN_RIGHTS)) {

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Is it something I can fix in the database? If not then how to run setup again, does the entire gallery need reinstalling again?

Thanks in advance

Make sure you really uploaded the files correctly and that the transfer was correct. Sometimes things can go wrong. To be sure try reupload the /zp-core folder. The error could indicate that.

To run setup again go to:
/zp-core/setup.php