Hi Pete.
The PHP on your webserver must have the GMP library and of course it must be installed in system.
You can check it: open admin panel of your website and click to System Info button on top, after find phrase GMP via browser.
Result must look like similar:
If your webserver doesn't have it that you can contact with hosting provider to fix it.
Read more about installation here: https://www.php.net/manual/en/gmp.installation.php
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