Powershell Workflows - powershell

Question

I wrote a PowerShell workflow that analyses the Excel data and triggers a mail based on the values in Excel.
I have developed a workflow which triggers mail but I'm having trouble in analysing the Excel data, where I couldn’t call the Send-Mail workflow.
Note: column “E-remainder 1” and “F-remainder 2” contains the date of the remainder mail to be sent.
Workflow test {
$worksheet = InlineScript {
$objExcel = New-Object -ComObject Excel.Application
$objExcel.Visible = $false
$WorkBook = $objExcel.Workbooks.Open(#filepath)
$worksheet = $workbook.Sheets.Item(#sheetname)
$currentdate = (Get-Date).ToString()
$rownumber = #contains rownumber from excel whose details has to be mailed
foreach ($i in $rownumbers) {
if ($worksheet.Range("B$i").Text -eq $currentdate) {
$output = [PSCustomObject][ordered]#{
ComputerName = $WorkSheet.Range("C$i").Text
Fromaddress = $WorkSheet.Range("D$i").Text
Toaddress = $WorkSheet.Range("E$i").Text
}
# I need to call a workflow which sends a mail
# (workflow which I have to trigger mail)
Send-Mail -To $output.Toaddress -From $output.Fromaddress -Name $output.ComputerName
} elseif ($worksheet.Range("F$i").Text -eq $currentdate) {
$output = [pscustomobject][ordered]#{
ComputerName = $WorkSheet.Range("C$i").Text
Fromaddress = $WorkSheet.Range("D$i").Text
Toaddress = $WorkSheet.Range("E$i").Text
}
# I need to call a workflow which sends a mail
# (Based on my knowledge I know that we couldn't call a workflow inside the inline script)
Send-Mail -To $output.Toaddress -From $output.Fromaddress -Name $output.ComputerName
}
} # foreach ends
} # Inline ends
} # workflow ends
Im getting the following error:
ERROR:The term "Send-Mail" is not recognized as the name of the cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.