Retro Achievements not working on Mupen+Next

Hey everyone,

in Retroarch 1.8.4, retro achievements don’t work with the Mupen Plus Next core anymore. It works fine on 1.8.1, but on newer versions I get this error message:

“cannot activate achievements using this core.”

I’ve found threads online which describe the same problem, however, there does not seem to be a solution. I’ve tried several different Retroarch versions:

1.8.1: works 1.8.4 doesn’t work 1.8.3: doesn’t work Latest Nightly: doesn’t work

I tested using the most up to date Mupen core, so it seems to be a problem within Retroarch. Does anyone have the same issues?

Working again with new Nightly version. Thanks!