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Nvm, i found the error. Thank you for all your help on this project danpost!

Do you create and add a Counter object into the world? What is your Actor class substructure like (what extends what)? What is the current codes for the bullets and the aliens?

Thank you. I ll try that

Nevermind, it worked, thank you so much man

You are showing the Row class where the method is being called from. The problem is that you do not yet have that method in your Alien class to call.

Little update. NCCB T

A method which isn't called won't do anything. You only call the randomSpawn method once when the world is created. Instead, you want to call it every act cycle, so it has to be in the act method or it has to be called from the act method.

thank you it works as wanted

Thank you for the answer, I've followed the documentation step by step but the project dosn't start. When I run the project, It opens a dialog that shows : greenfoot.export.GreenfootScenarioApplication class wasn't found in LTA project. <<No main classes found>> I don't understand why, the greenfoot.jar that I have imported contains that class(GreenfootScenarioApplication.class). There is onother problem, when I compile the project, the terminal show me this message: warning: unknown enum constant Tag.Any reason: class file for threadchecker.Tag not found warning: unknown enum cons

Please show entire method.

That really did not explain what you think each line does. You need to do more than one thing when the actor is clicked -- spawn an actor and play a sound. Therefore, you will need a block of code for the if statement: <Code Omitted>Now, "spawn" means "create and add to the world". You create an object by using the new keyword. For example (not your actual code -- just showing use of the keyword): <Code Omitted>Then, you add it into the world by using the

I cannot see a need for the SmoothMover class for a "Line" object. It will not be moving. I suggest just placing a new "Line" object at the cycle's location before it moves and move just enough to not have the center of the cycle image over that new "Line" object. That way you can use the getObjectsAtOffset(0, 0, << "Line" class name +".class" >>) method to check for collisions.

Where in the class did you try this?