i cant use kapk

it gives me this error everytime

Mmm, this is pretty strange, which version of Android are you running? Did you try to use your own keystore?

6.0.1 im using the keystore the app generated

Same problem. Both with automatic and manual.. Android 6.0.1 MMB29M. Ready to provide additional information

Bingo! I solved my problem by changing the type of my keystore from the JKS to BKS-V1 using KeyStore Explorer