how to get all topics list in repository based folder ID?



I am trying to write all the topics in a repository in a text file based on the root folder ID. Below is my code


Import-Module ISHRemote

# first authenticate

$ishSession = New-IshSession -IshPassword 'xxxx' -IshUserName 'xxxxx' -WsBaseUrl ''

$folderId = 3222 #use correct folder id

$ishObjects = Get-IshFolderContent -IshSession $ishSession -FolderId $folderId | Out-File D:\objectlist.txt


This is not writing anything, anybody can help me what I am doing wrong here? 

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