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我試圖更新我在谷歌開發者的應用程序，但收到錯誤消息：上傳失敗，APK 2級證書的條目是有效
>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，使用密鑰工具，密鑰庫文件包含2項，既這些證書。
除了密鑰庫中的有效條目，我如何獲得Developer？