Error on notification "jumpDefinition": definition provider not found for current buffer, your language server don't support it.

[igotcha]

After :PlugInstall got error:

vim-go
   fatal: invalid reference: *

and

Error on notification "jumpDefinition": definition provider not found for current buffer, your language server don't support it.

fixed by manual:

mkdir -p ~/.vim/pack/coc/start
cd ~/.vim/pack/coc/start
curl --fail -L https://github.com/neoclide/coc.nvim/archive/release.tar.gz|tar xzfv -

https://github.com/neoclide/coc.nvim/blob/release/doc/coc.txt