Error : The provider 'vsphere' could not be found, but was requested to back the machine

[RashmiRamanna]

I had installed plugin for vsphere as explained in the README of this repo.
My vagrantfile to create vms in vsphere was working perfectly fine. But after few times, the command vagrant up or even the vagrant status is throwing below error

"The provider 'vsphere' could not be found, but was requested to back the machine 'VM-1'. Please use a provider which exists"

The out for the command "vagrant plugin list" is as below
vagrant-share (1.1.9, system)

vagrant version installed is 2.0.1

And my machine on which I am using vagrant is Ubuntu-16.04.1

Please let me know what I am missing.

[RashmiRamanna]

I installed vsphere plugin again. It works as expected.
But my question what would have uninstalled vsphere plugin?

[RashmiRamanna]

I even see winrm plugin is been removed