Get-ConfluenceAttachment

[Carshalton]

Hi,
when I run the Get-ConfluenceAttachment below to get the attachment for the page,
Get-ConfluenceAttachment -PageID 123456

the following exception is thrown. can you please help?

ConvertTo-Attachment : Exception calling "ToInt32" with "2" argument(s): "Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: startIndex"
At C:\Program Files\WindowsPowerShell\Modules\ConfluencePS\2.4.1\ConfluencePS.psm1:1053 char:43
+                                 $result | & $converter
+                                           ~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [ConvertTo-Attachment], MethodInvocationException
    + FullyQualifiedErrorId : ArgumentOutOfRangeException,ConvertTo-Attachment