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Welcome,
Tell something about your project. How big is your aia? Do you use large assets?
do a search in the community to find some similar questions (and answers)
https://community.appinventor.mit.edu/search?q=The%20compiler%20output%20error%20was
Taifun
Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by 
Taifun.