How to circumvent that:
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From the Projects list of MIT AI2 Export the aia of the project in question.
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Install 7zip and use it to open the aia, a zip file. Alternatively, change its extension from .aia to .zip, and have Windows open it as a compressed folder.
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It should look like
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Open the youngandroidproject folder
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Open the project.properties file with a text editor, like Notepad++
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Change the lastopened to Screen1
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Save and close, and rename the .zip back to .aia
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Project->Import the modified .aia file.
I am basing this on the expectation that the problem is AI2 being befuddled by trying to open a nonexistent Screen.