'Exception calling "Desktop_Update" with "3" argument(s)' when using Start-HVPool on one pool

[rnelson0]

I'm using VMware.Hv.Helper in an internal script, like so:

Start-HVPool -Recompose -Pool $Pool -LogoffSetting $LogoffSetting -ParentVM $ParentVM -SnapshotVM $Snapshot -StartTime $StartTime -ErrorAction Stop

I have two pools, with the same ParentVM, SnapshotVM, and LogoffSetting, so the only difference in the call is the name of the pool. On one pool, this works fine:

Performing RECOMPOSE on POPSandbox_1
Performed recompose task on Pool:  POPSandbox_1

On the other, I get an exception, though the recompose is started:

Performing RECOMPOSE on POPViewTest_1
Start-HVPool : Exception calling "Desktop_Update" with "3" argument(s): "ExceptionType : VMware.Hv.UnexpectedFault
ErrorMessage : Encountered unexpected error during execution
CauseString : java.lang.NullPointerException
CauseStackTrace : System.String[]
ErrorCode : 
ErrorAttributes : "
At line:120 char:9
+         Start-HVPool -Recompose -Pool $Pool -LogoffSetting $LogoffSet ...
+         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Start-HVPool], MethodInvocationException
    + FullyQualifiedErrorId : VimException,Start-HVPool

As I said, the recompose starts properly. When performing a manual recompose in the View client with the same settings, no errors are observed. Any idea where to begin troubleshooting this?