Hi, welcome to the community 
It’s better to copy/paste your code into the forum rather than putting screenshots in, it tends to have greater readability, especially on mobile devices. It also enables those that offer to help you the ability to copy/paste parts of your code back to you with corrections/suggestions. Please also apply code formatting characters before and after the code (see below).
Regarding the error, your class AdventureGame doesn’t know what the type State is, e.g. the class. Have you created this yet?
See also;
- Forum User Guides : How to apply code formatting within your post