Powershell skripta

A ima kdo idejo zakaj tole ne dela?
Imam en velik log fajl in bi rad, da se naredi en txt fajl, ko najde stavke, ki sem jih zapisal v moj kontrolni fajl.
Naprimer v mojey my.txt je tole
"error path not found"
"wrong disk selected"
"backup size 0Mb"
ko najde katerikoli stavek od teh treh mora narediti error.txt

$file = "E:\B\LOG.txt"
$pattern = Get-Content "E:\B\my.txt"
$error = "E:\B\error.txt"
$content = Get-ChildItem $file | Select-String -Pattern $pattern 
if ($content) {New-Item $error -Force

}
else{Remove-Item -Path E:\B\error.txt -Force}

-a---- 17.11.2019 13:28 0 Cannot bind argument to parameter 'Pattern' because it is null.

-a---- 17.11.2019 13:28 0 Cannot overwrite variable Error because it is read-only or constant.