vagrant 无法启动

Bringing machine 'default' up with 'virtualbox' provider...
==> default: Clearing any previously set forwarded ports...
There was an error while executing `VBoxManage`, a CLI used by Vagrant
for controlling VirtualBox. The command and stderr is shown below.

Command: ["modifyvm", "16cb402f-a6cd-4410-ac98-eb9940a77e81", "--natpf1", "delete", "ssh"]

Stderr: VBoxManage.exe: error: The machine 'vagrant_default_1467171670941_25152' is already locked for a session (or being unlocked)
VBoxManage.exe: error: Details: code VBOX_E_INVALID_OBJECT_STATE (0x80bb0007), component Machine, interface IMachine, callee IUnknown
VBoxManage.exe: error: Context: "LockMachine(a->session, LockType_Write)" at line 471 of file VBoxManageModifyVM.cpp

• 删除virtualbox和vagrant进程

http://blog.purazumakoi.info/?p=143

• 关闭vagrant

http://www.d-wood.com/blog/2014/01/29_5352.html