powershell - Errors in listing AD groups for AD PCs -

i writing script work , trying determine why code showing errors. new coding , want understand wrong.

the errors tag .... pc listings in .txt file.

ex: get-content : cannot find path 'f:\tag 77909' because not exist. confusion when write-host after .replace code prints correctly

ex:you cannot call method on null-valued expression. + $notags =$pc.replace <<<< ("tag ", "pc") + categoryinfo : invalidoperation: (replace:string) [], runtimeex ception + fullyqualifiederrorid : invokemethodonnull

last error prints out last pc.... id in .txt file listing??? unsure why given have foreach loop

**my code far:**  import-module activedirectory  $compimports = get-content "c:\temp\temp\input.txt" $groupexport = "c:\temp\temp\output.txt" clear-content $groupexport  $header = "pc name" + "|" + "group name" + "|" + "group description"  #write header  $header | out-file $groupexport -append  #get pc tag listing $pcs = get-content $compimports  #for loop change "tag " "pc" foreach($pc in $pcs) { $notags =$pc.replace("tag ", "pc") }  #loop information , print out foreach ($notag in $notags) {    $computerobj = get-adcomputer $notag -properties memberof     $computerobj.memberof | ? {$_ -match '^cn=app.*'} `    | % {get-adgroup $_ -properties name, description} | `    % {$computerobj.name + "|" + $_.name + "|" + $_.description `    | out-file $groupexport -append} } 

i see @ least 1 issue here

$compimports = get-content "c:\temp\temp\input.txt" ... $pcs = get-content $compimports 

you calling get-content twice generate error seeing likely. simplified

$pcs = get-content "c:\temp\temp\input.txt" 

your other error should go away result since $pcs should contain real data @ point.