Signtool error: No certificates were found that met all given criteria with a Windows Store App?

Question

I\'m trying to sign a Windows 8 appx package with a pfx file I have. I\'m using a command like so:

signtool.exe sign /fd sha256 /f \"key.pfx\" \"app.appx\"
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Answer 1

I'm having the same problem, reading some answers (posted here), I saw my certificate expired.

Just create a new one from my start project. Then at certificates manager deleted the expired certificate.

Now everything compiles fine.