Virtual Machine error while adding to the DVPortGroup in the vSphere Client

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Hello,
I was trying to add a Virtual machine to the DVPortGroup in the vSphere Client but it failed and displayed an error message. I need your help to resolve this error message and tell me cause of this error. The attached image will show you the error message.
Thanks.
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Create virtual machine
The resource vim.dvs.DistributedVirtualPort is not available in
vim.dvs.DistributedVirtualPortgroupAutoExpand.
See the error stack for details on the cause of this problem.
Time: 1/28/2012 3:14:50 PM
Target: home
vCeriter Server: vcenter01
No free port is available in DVportgroup AutoExpand
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