What does this error mean? Array keys exists

[devroys]

Hello everyone!

I am working on connecting my PrestaShop website to a shipping service, and the provider informed me that I need to resolve an issue before proceeding. Could anyone advise on how to address this? They mentioned that it’s something I need to resolve on my end. Could anyone explain what this might entail?

Thank you in advance.

 

[d-shilko]

It is a mean function deprecated. you must use "isset". It is easy to fix!