トラブルシューティング: coreos-vagrant の NFS mountに失敗した件

More than 3 years have passed since last update.
NFS is reporting that your exports file is invalid. Vagrant does
this check before making any changes to the file. Please correct
the issues below and execute "vagrant reload":

exports:8: /Users/k12u conflicts with existing export /Users/k12u/src/

/etc/exports に不要な設定が残っていたため。