Error using Import-PWDocuments with -IncludeEmptyFolders

Test code:

$importSplat = @{
	InputFolder          = "C:\CADDLib\TestImport"
	ProjectWiseFolder    = "Users\KvanHaaren\TestImport"
	DefaultStorage       = "WorkSpaces"
	Exclusions           = @('thumbs.db','*.bak','*.tmp')
	Overwrite            = $true
	IncludeEmptyFolders  = $true
	SkipDateCheck        = $true
	SuppressOutput       = $true
	MultiThreaded        = 20
	ExcludeSourceDirectoryFromTargetPath = $true
}
Import-PWDocuments @importSplat -Verbose -WarningAction Continue -ErrorAction Stop

Error:

Import-PWDocuments : Value does not fall within the expected range.
At C:\Code\_Tests\ImportFolderTest.ps1:13 char:1
+ Import-PWDocuments @importSplat -Verbose -WarningAction Continue -Err ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Import-PWDocuments], ArgumentException
    + FullyQualifiedErrorId : System.ArgumentException,PWPS_DAB.ImportPWDocuments

Comment out IncludeEmptyFolders and it works (except for not creating the empty folders)