Certificates google play console

Questions
1

I compiled an app and sent it to Google Play, I needed to update it and did a new build. When I sent it he gave this error talking about a certificate. How can I fix this? Thanks.

You have sent an unsigned APK with the upload certificate. You must use the same certificate. The upload certificate has the fingerprint:
SHA1: 21: 29: A2: 0A: 3C: 57: CC: 44: B6: 21: CB…
, and the certificate used to sign the submitted APK is fingerprinted:
SHA1: A4: CE: 4E: 84: 7D: 93: 94: 8F: 93: 7E: 89:…

2

My voltbuilder.json:

{
    "androidDname": "cn=myname, ou=mygroup, o=mycompany, c=mycountry",
    "platform": "android",
    "release": "release"
}
3

Tip : If you’re pasting code, html or config files, surround the code with triple back ticks (```), before the first line and after the last one. It will be formatted properly.

4

To replace an existing app, you need to use the same keystore time. Since you’re not supplying a keystore file, VoltBuilder uses the androidDname information to create a new keystore each time.

There’s more on setting up the keystore file here.