HP WallArt Wordpress Plugin error

Hi, I've attached a screenshot below of an error I'm having difficulty fixing. I've integrated the HP WallArt WordPress and woocommerce plugins (seemingly successfuly) such that the HP WallArt designer populates the customer's e-commerce basket. However, the basket always shows the attached error. Namely: "Warning: Missing argument 3 for ... hpwallart.php on line 202" (see attached) Examing the hpwallart.php file the function on line 202 takes three arguments, with the third being $cart_item_key. Please could you help me identify why this argument isn't being picked up (or set) or identify why the error is occurring? I've searched for a resolution online but there's scant information available. Your help would be appreciated. We're nearly there with the site! Thank you and regards, Chris

Hi Sonia, Thanks for your feedback. Just a few more questions for clarification, if I may? Yes, the HP plugin on our site is installed on this path: /public_html/wp-content/plugins/hpwallart. Do you mean it should be installed on this path instead /wp-content/plugins/hpwallart? (i.e. above public_html??). Since the plugin installation notes state "Upload HP WallArt plugin to the /wp-content/plugins/ directory". If so, are you implying that the whole wordpress installation - including theme and woocommerce - should be installed at this level above public_html? Since having two /wp-content/... folders seems highly unusual. We just installed the HP plugin using the default Wordpress process, i.e. plugins/add plugin/upload plugin/choose file/install now. No path options were available. Else, do you mean change the HP plugin url in wp-config.php (it's currently not set there) or in some other configuration option? Clearly, I'm a bit confused. I'm happy to provide access to the site or further info if the HP support need it. P.S. Regarding the theme, we're using Divi, which is 'officially' compatible with woocommerce. The HP Plugin details notes say "You can use any template, compatible with Woocommerce", so we went with Divi Thanks again, Chris

P.P.S. Hi, just to confirm, the HP plugin url is https://www.custom-wallpaper.co.uk/design/ There is no directory level in between.

Hi Sonia, Thanks again for your response. I have tried two of the supported themes but experience exactly the same error when viewing the basket/cart after creating an order using the HP WallArt plugin. I have even created a completely new WordPress install using the Topshop theme, along with a fresh install of woocommerce and the HP Wallart plugin. Again, same error (image attached). The HP WallArt plugin is installed in the root directory. I'll have to contact the suggested support at hpapplicationscenter.support@hp.com. Thank you for assistance with this. Kind regards, Chris