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Possible Duplicate:
Re-installation failed due to different application signatures
when I try to run an app on my device, eclipse tells me the following:
Re-installation failed due different application signatures.
how to fix such an error?
You must first uninstall the application (that has the old signature) — and, then, install the one with the new signature.
Note: actually, this is one of the reason why there is a security system like these signatures: it makes sure no user will think he’s updating an application, when he is actually replacing it by another one, possibly fake (as, in theory, only the real original author has the ability to sign with his own signature)