Powershell error Add-PSSnapin "Microsoft.SharePoint.PowerShell"

Question

I am getting an error when I run below command from sharepoint 2010 managment shell using admin rights.

Add-PSSnapin Microsoft.Sharepoint.Powershell

Add-PSSnapin : Cannot add Windows PowerShell snap-in Microsoft.Sharepoint.Power
shell because it is already added. Verify the name of the snap-in and try again

Answer 1

Check to see if module is already loaded:

if (Get-Module -ListAvailable -Name SomeModule) {
  Write-Host "Module exists"
} else {
  Write-Host "Module does not exist"
}

Source: How do I check if a powershell module is installed?

UPDATED:

Try { 
    if((Get-PSSnapin -Name Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue) -eq $null){ 
        Add-PsSnapin Microsoft.SharePoint.PowerShell 
    } 
}Catch{

}