This error, in most cases, is due to the version of PHP installed on your server.
The minimum requirement for inVogue is PHP version 7.4 (required for Woocommerce) but it is recommended to update to the latest available version provided by your host.
Updating PHP can vary depending on your hosting provider, but in general, it should be possible to do so from your hosting control panel. Below are several links to guides provided by some popular hosting providers on how this can be done on their respective platforms.
If you are not able to update PHP yourself from your hosting control panel it would then be necessary to contact your hosting provider to check if they are able to do this for you.