What is signing keys

When I upload to play store there is error like this:

Your Android App Bundle is signed with the wrong key. Ensure that your App Bundle is signed with the correct signing key and try again. Your App Bundle is expected to be signed with the certificate with fingerprint:

SHA1: 5B:0A:DE:D3:CA:60:CB:F4:95:CC:F9:2B:0A:1C:60:A5:B9:75:AA:C4

but the certificate used to sign the App Bundle you uploaded has fingerprint:

SHA1: EF:7E:9F:37:C2:EA:A3:6B:9E:DF:46:D9:

How to solve this? Thank you

The community has an excellent search function.

https://community.appinventor.mit.edu/search?q=app%20bundle%20key%20order%3Alatest