This is the screen that appears when I save the project.

MIT App Inventor Help
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IMG_7413
IMG_74131280×768 91.7 KB

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What are the components, assets you are using in this projects? Number of arrangements, lables etc?

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(Canned Reply: ABG- Export & Upload .aia)
Export your .aia file and upload it here.
export_and_upload_aia

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A huge guess is the screen MODHI2 has an issue. Try deleting that screen on a copy of your Project and run the build again.
taskerror