how to define a model so it's available for rules UI?

I created a model, and whe i try to create a rule i allways recieve 开发者_运维知识库this message:

"Note: No model has been defined. Tip: You will want to import or define a model for this user interface to work !"

any ideas? TNX

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It is possible that you are missing an import.

In the file where you have the rule do:

import org.hello.MyModel;