keystore signature not working android -

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i have been working on application quite while without problem. 2 weeks ago generated keystore sign application. matter of fact develop on 2 machines @ home , in office. since generated keystore keep getting message whenever change machine:

    installation failed since device has application same package different signature. in order proceed, have uninstall existing application.  warning: uninstalling remove application data!  want uninstall existing application?

thanks


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