Need a script to check for available disk space on servers.

I can't get this script to work It is supposed to  gives a pretty graphical display of disk usage. I would truly appreciate someone who can help me with this..

This is the error message i'm getting

Out-File : Cannot bind argument to parameter 'FilePath' because it is null.
At C:\Users\cjm7\Desktop\html.ps1:75 char:56
+ ConvertTo-Html -head $head -body $fragments  | Out-File <<<<  $Path
    + CategoryInfo          : InvalidData: (:) [Out-File], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Microsoft.PowerShell.Commands.OutFileComm
   and

The term '.\drivereport.htm' is not recognized as the name of a cmdlet, function, script file, or operable program. Che
ck the spelling of the name, or if a path was included, verify that the path is correct and try again.
At C:\Users\cjm7\Desktop\html.ps1:77 char:18
+ .\drivereport.htm <<<<
    + CategoryInfo          : ObjectNotFound: (.\drivereport.htm:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

This is the script..

#requires -version 2.0
#use parameter  drive report to html.ps1 computer1,computer2 or a computer list file
#change file path and name on line 7 below to reflect name and  path of computer list file using.
#script will open web browser with current report when completed.

Param(
$computers =(Get-Content "C:\Scripts\Computers.txt")
)

$Title="Hard Drive Report to HTML"

#embed a stylesheet in the html header
$head =@"
<mce:style><!--
mce:0
--></mce:style><style _mce_bogus="1"><!--
mce:0
--></style>
<Title>$Title</Title>
<br>
"@ 

#define an array for html fragments
$fragments=@()

#get the drive data
$data=Get-WmiObject-ClassWin32_logicaldisk-filter "drivetype=3"-computer $computers

#group data by computername
$groups=$Data |Group-Object-PropertySystemName

#this is the graph character
[string]$g=[char]9608 

#create html fragments for each computer
#iterate through each group object
        
ForEach($computer in $groups){
    
    $fragments+="<H2>$($computer.Name)</H2>"
    
    #define a collection of drives from the groupobject
    $Drives=$computer.group
    
    #create an html fragment
    $html=$drives |Select@{Name="Drive";Expression={$_.DeviceID}},
    @{Name="SizeGB";Expression={$_.Size/1GB -as[int]}},
    @{Name="UsedGB";Expression={"{0:N2}"-f (($_.Size- $_.Freespace)/1GB)}},
    @{Name="FreeGB";Expression={"{0:N2}"-f ($_.FreeSpace/1GB)}},
    @{Name="Usage";Expression={
      $UsedPer=(($_.Size- $_.Freespace)/$_.Size)*100
      $UsedGraph=$g *($UsedPer/2)
      $FreeGraph=$g*((100-$UsedPer)/2)
      #I'm using place holders for the < and > characters
      "xopenFont color=Redxclose{0}xopen/FontxclosexopenFont Color=Greenxclose{1}xopen/fontxclose"-f $usedGraph,$FreeGraph
    }}|ConvertTo-Html-Fragment 
    
    #replace the tag place holders. It is a hack but it works.
    $html=$html -replace"xopen","<"
    $html=$html -replace"xclose",">"
    
    #add to fragments
    $Fragments+=$html
    
    #insert a return between each computer
    $fragments+="<br>"
    
}#foreach computer

#add a footer
$footer=("<br><I>Report run {0} by {1}\{2}<I>"-f (Get-Date-displayhint date),$env:userdomain,$env:username)
$fragments+=$footer

#write the result to a file
ConvertTo-Html-head $head-body $fragments  |Out-File $Path

.\drivereport.htm