Fix replication error log formatting

certy.ps1

@@ -262,7 +262,7 @@ function Invoke-Replication {
                 Invoke-Command -ComputerName $server -ScriptBlock { param($c) & $env:ComSpec /c $c } -ArgumentList $remoteCmd |
                     ForEach-Object { & $Log $_ }
             } catch {
-                & $Log "Replication error on $server: $($_.Exception.Message)"
+                & $Log ("Replication error on {0}: {1}" -f $server, $_.Exception.Message)
             }
             continue
         }