how install Exchange server 2013 in windows server 2012

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Windows

Exchange-Server

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Hi.
i will install EXCHANGE SERVER 2013 in windows server 2012.
error in installing:
Error:
The following error was generated when "$error.Clear();
$vdirName = "PowerShell";
$InternalPowerShellUrl="http://" + $RoleFqdnOrName + "/powershell";
new-PowerShellVirtualDirectory $vdirName -Role Mailbox -InternalUrl $InternalPowerShellUrl -DomainController $RoleDomainController -BasicAuthentication:$false -WindowsAuthentication:$false -RequireSSL:$false -WebSiteName "Default Web Site" -AppPoolId "MSExchangePowerShellFrontEndAppPool";
new-PowerShellVirtualDirectory $vdirName -Role Mailbox -DomainController $RoleDomainController -BasicAuthentication:$false -WindowsAuthentication:$true -RequireSSL:$true -WebSiteName "Exchange Back End" -Path ($RoleInstallPath + "ClientAccess\PowerShell-Proxy");
" was run: "The Web site 'Default Web Site' on server 'Server.sunmoon.com' doesn't exist. Web site names are case sensitive.
Parameter name: WebSiteName".

Error:
The following error was generated when "$error.Clear();
$vdirName = "PowerShell";
$InternalPowerShellUrl="http://" + $RoleFqdnOrName + "/powershell";
new-PowerShellVirtualDirectory $vdirName -Role Mailbox -InternalUrl $InternalPowerShellUrl -DomainController $RoleDomainController -BasicAuthentication:$false -WindowsAuthentication:$false -RequireSSL:$false -WebSiteName "Default Web Site" -AppPoolId "MSExchangePowerShellFrontEndAppPool";
new-PowerShellVirtualDirectory $vdirName -Role Mailbox -DomainController $RoleDomainController -BasicAuthentication:$false -WindowsAuthentication:$true -RequireSSL:$true -WebSiteName "Exchange Back End" -Path ($RoleInstallPath + "ClientAccess\PowerShell-Proxy");
" was run: "The AD configuration for virtual directory 'PowerShell' already exists in 'CN=PowerShell (Exchange Back End),CN=HTTP,CN=Protocols,CN=SERVER,CN=Servers,CN=Exchange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=SUNMOON,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=sunmoon,DC=com', please remove this AD configuration manually.
Parameter name: VirtualDirectoryName".


please help me.
thnx