Hi,
I suggest connecting a cable and looking at the printout during install 
where it gives more details. These can happen because of:

- Changed certificate - it's crucial to always use the same certificate in 
Android!!!
- Changed package or visibility - if you refactored the main class or made 
any changes like that
- Downgraded target version - The target version can only go up, if you 
changed that downwards it can fail

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