Emulator doesn't work

I want to start an emulator on the school computer.
When I start aiStarter and press "emulate" it shows
me that the aiStarter is not started. At first it works, but now
it just came up that error.

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Could you please explain "At first it works, but now it just came up that error."    Does this mean that you were previously able to run your Project in the emulator but after adding features to your app it no longer loads  or  something else?

If you can load a simple Project (create a new Project.  Put a button on the screen (that is the entire new Project).  Now attempt to load it in the emulator.  If the simple Project works (you can see the image of the button in the emulator) but your other project does not work, it is probable you have coding issues with your Project, you are attempting to use more than 10 screens, or you have lots of large images etc.   If the simple Project works by your main Project does not, please tell us more about your interesting Project and someone might be able to provide a suggestion to get it to work.

Have you been regularly saving an aia file?   If you code once worked, loading a recent aia might work.  Does it?

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Check the version on the MIT AI2 Companion in your emulator.

If it's not 2.41, do an AI2 Connect -> Hard Reset and follow the instruction from there.

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