Test-CsPhoneBootstrap: Exception has been thrown by the target of an invocation.

Hi,

I have tried to run this command:

Test-CsPhoneBootstrap -PhoneOrExt xxxxxxxxxxxx -PIN xxxxx -Verbose

but received the following error. 

Test-CsPhoneBootstrap : Exception has been thrown by the target of an invocation.
At line:1 char:22
+ Test-CsPhoneBootstrap <<<<  -PhoneOrExt xxxxxx -PIN xxxx -Verbose
    + CategoryInfo          : NotSpecified: (:) [Test-CsPhoneBootstrap], TargetInvocationException
    + FullyQualifiedErrorId : System.Reflection.TargetInvocationException,Micr
   osoft.Rtc.Management.SyntheticTransactions.TestPhoneBootstrapCmdlet

I have searched the site for similar errors but have had no success with the solutions. Windows PS 2 and .NET 3.5 SP1 is already installed on this Windows 7 machine. This computer is on the same VLAN as the phone itself.

Any suggestions would be much appreciated.

Thanks!

David