That's an issue on the developers side... each time a developer publishes something to the market they have to sign or verify an app with a certian alias and this error can crop up if they swtiched alias at somepoint in development eithr between updates or if they reuploaded the APK file. There's nothing you can do about it on your end save from sending the developers an email letting them know that they need to resolve the issue. But it's not a huge deal and most developers can solve the issue quite quickly, so I wouldn't worry too much about it.
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