VA Smalltalk displays messages in the System Transcript window. If it gives the message

you'll need to add a prerequisite to the application on which you're working.

Add as the prerequisite the application containing the class named in the message.

For example, suppose your application contains a method myMethod that refers to the part AnyView, and you get the message

To fix this, add the application containing AnyView to the list of prerequisites for your application.