==> default: Exporting NFS shared folders...
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:2: path contains non-directory or non-existent components: /Users/<username>/path/to/vagrant
exports:2: no usable directories in export entry
exports:2: using fallback (marked offline): /
exports:5: path contains non-directory or non-existent components: /Users/<username>/path/to/vagrant
exports:5: no usable directories in export entry
exports:5: using fallback (marked offline): /
This means that you may already have old vagrant path definitions in your /etc/exports
file.
Try opening up /etc/exports
file to identify old or unwanted vagrant paths and removing them if necessary
On opening /etc/exports
file each set begins with # VAGRANT-BEGIN: and ends with # VAGRANT-END:. Make sure to delete these and any other lines between VAGRANT-BEGIN: and VAGRANT-END:
or maybe
sudo rm /etc/exports
sudo touch /etc/exports
vagrant halt
vagrant up