Issue with Importing VM from vsphere into Vapp

I've the issue with importing vm from vsphere into existing vapp in vcloud director (8.0)

the following message error when i use import-civapp ...

Import-CIVApp, the vSphere server with UUID ...... is not found on this cloud Instance.

And yet I am sure that the vCenter I use is good

Any Idea ?

Code:

Connect-VIserver .... 
Connect-CIServer ... 
$vm=Get-VM test

Get-CIVapp $vappName | Import-CIVApp $vm