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我试图更新我在谷歌开发者的应用程序，但收到错误消息：上传失败，APK 2级证书的条目是有效
>Upload failed
>
>You uploaded an APK that is signed with a different certificate to your >previous APKs. You must use the same certificate. Your existing APKs are >signed with the certificate(s) with fingerprint(s):
>
>[ SHA1: AF:AF:68:1E:2B:5C:99:23:4D:B9:87:F6:D6:2F:9D:5A:9A:BE:34:EC ]
>
>and the certificate(s) used to sign the APK you uploaded have >fingerprint(s):
>
>[ SHA1:2A:84:1D:BC:91:68:55:B1:F3:90:47:FB:3B:56:29:21:F2:38:4A:37 ]
然而，使用密钥工具，密钥库文件包含2项，既这些证书。
除了密钥库中的有效条目，我如何获得Developer？