Building APK certificate error

I'm trying to export my app for release, from testing so:
- Checked the release option
- Change the certificate with mine signed certificate, instead "default"

The build fails with:
Build error
Most likely build error cause:
App signing error has occurred. Please check your key/certificate alias and passwords.

alias and passwords are ok, so what is wrong?

Please note, my certificate is set as default, and previous exporting are in relrease with "use default" certificate choice .
1 person has
this question