Problems opening a packaged project

Hey there Unreal Fellows, I am new to the forum and new user to Unreal Engine 4 for Archviz

I am here today to ask for your wisdom because I got a client who got my packaged file (Project finished) and is having this error windows when he tries to open it.

I am not familiar with this kind of issues so I was hoping that any advice of how to solve it.

Thank you in advice and have a great day :slight_smile: