ConvertFrom-String Error

ORIGINAL CODE
-------------------------

#extract utils data and clean
$listbook=gci $rootpath -File -filter *.pdf | foreach { New-Object psobject -Property @{file=$_.fullname; books= ((iwr "https://arxiv.org/abs/$($_.BaseName)").ParsedHtml.body.outerText | ConvertFrom-String -TemplateContent $template)}} | select file -ExpandProperty books |  select file,  @{N="Subject";E={Clean-InvalidPathChars $_.subject}}, @{N="Title";E={Clean-InvalidFileNameChars $_.title}}

-----------------
INTO like this ?
-----------------

#extract utils data and clean
$listbook=gci $rootpath -File -filter *.pdf | foreach { New-Object psobject -Property @{file=$_.fullname; books= (($wr = iwr "arxiv.org/abs/quant-ph/9802001";;)")$outer = $wr.ParsedHtml.body.outerHTML; | $outer | ConvertFrom-String -TemplateContent $template;)}} | select file -ExpandProperty books |  select file,  @{N="Subject";E={Clean-InvalidPathChars $_.subject}}, @{N="Title";E={Clean-InvalidFileNameChars $_.title}}