emacs: seq-1.11 not found while booting with prelude

Question

I'm new to emacs, and I'm getting started with prelude configuration. While invoking emacs, I've got a message: error "Package 'seq-1.11' is unavailable". It might be the dependency of beacon package according to the --debug-init log. Although it seems seq package is inside https://elpa.gnu.org/packages/ depository, I couldn't find the package in package-install. I've even tried to install the seq package manually to ~/.emacs.d/elpa/, but the same error message--seq is unavailable was still there. Any ideas to solve the problem? Thanks a lot.