Fatal error when clicking on any product

hi,

Brand new to SureCart, so thought I would try the free version to explore it a bit.

I created some test products and the shop loads although whenever I click on any of the products I receive a fatal error on the webpage and this inside the debug:

Deprecated: Creation of dynamic property SureCartVendors\GuzzleHttp\Psr7\CachingStream::$stream is deprecated in /home/runcloud/webapps/domain-name/wp-content/plugins/surecart/vendor/guzzlehttp/psr7/src/CachingStream.php on line 34

Can anyone point me in the right direction to what I would need to do to resolve it?

Thanks!