Check out example codes for "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":". It will help you in understanding the concepts better.

Code Example 1

sudo rm /etc/exports
sudo touch /etc/exports

vagrant halt
vagrant up

Code Example 2

==> 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:

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