How to call function within a script

Function set-maxthreadpolicy {
   [CmdletBinding(SupportsShouldProcess=$true,ConfirmImpact="Medium")]   
        Param([string]$policy,
              [int]$count )
$rootDSE = [ADSI]"LDAP://rootDSE"
$config = $rootDSE.configurationNamingContext
$queryPolicies = [adsi]"LDAP://CN=Default Query Policy,CN=Query-Policies,cn=Directory Service,cn=Windows NT,CN=Services,$config"
$oldvalue = $queryPolicies.lDAPAdminLimits | ?{$_ -match $policy}
$queryPolicies.PutEx(3,"lDAPAdminLimits",@("$policy=$count"))
$queryPolicies.Setinfo()
$queryPolicies.PutEx(4,"lDAPAdminLimits",@("$oldvalue"))
$queryPolicies.Setinfo()
 }



Function put-maxthread {


[CmdletBinding(SupportsShouldProcess=$true,ConfirmImpact="Medium")]
   param (
       [parameter(Mandatory=$true,ValueFromPipeline=$false,Position=1,ParameterSetName="ByFarm",HelpMessage="Enter the farmID")]
       [Microsoft.exchange] $Farm,

       [parameter(Mandatory=$true,ValueFromPipeline=$false,Position=2,ParameterSetName="ByNetwork",HelpMessage="Enter the networkID")]
       [Microsoft.exchange] $Network,

       [parameter(Mandatory=$true,ValueFromPipeline=$false,Position=3,ParameterSetName="All",HelpMessage="ALL exch servers")]
       [switch] $All
       )

       $vms = $null
       switch ($PsCmdlet.ParameterSetName)
       {
           "ByFarm" { $vms = Get-GridVM -Role exch01 -Farm $Farm }
           "ByNetwork" { $vms = Get-GridVM -Role exch01 -Network $Network }
           "All" { $vms = Get-GridVM -Role exch01}
} 

$password = Read-Host -assecurestring "Please enter your password for SPODS Administrator account"
Import-Module activedirectory
foreach($vm in $vms)
{
Write-Verbose $vm
$endfqdn = (get-griddsfarm -identity $vm.farmid).dsfqdn
$fqdn = $vm.name + "." + $endfqdn
$user = "$endfqdn\Administrator"
$creds = New-Object System.Management.Automation.PSCredential ($user, $password)
$Domain = get-addomain -server $fqdn
$PDCEmulator = ($Domain).PDCEmulator
if ($fqdn -eq $PDCEmulator) {
Write-Host "$fqdn is the PDC Emulator"-ForegroundColor Green
Write-Host "Connecting to $fqdn as $user" -ForegroundColor Gray
Invoke-Command -Credential $creds -ComputerName $fqdn -ScriptBlock {
Import-Module activedirectory
$SPODSDomain = get-addomain
$Target = ($SPODSDomain).DomainControllersContainer
$Forest = ($SPODSDomain).Forest
policy=  invoke-command -scriptblock { set-maxthreadpolicy -policy MaxPoolThreads -count 5}
Write-Host "$policy is not 4 " -ForegroundColor Green
}

} }
   } # THE END

I receive this error

The term 'set-maxthreadpolicy' is not recognized as the name of a cmdlet, function, script file, or operable program. C
heck the spelling of the name, or if a path was included, verify that the path is correct and try again.
    + CategoryInfo          : ObjectNotFound: (set-maxthreadpolicy:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException