BUG - Error douring deploy on Heroku by button

[telefonosuci]

I use the default version:
The go.mod file for this project does not specify a Go version
!!
!! Defaulting to go1.12.1

Trying to deploy the app on Heroku by clicking on the button "Deploy to Heroku" at this link "https://elements.heroku.com/buttons/netlify/gocommerce" I get this error douring deploy:

-----> Running: go install -v -tags heroku github.com/netlify/gocommerce
build github.com/netlify/gocommerce: cannot load crypto/ed25519: cannot find module providing package crypto/ed25519
! Push rejected, failed to compile Go app.
! Push failed