Aspeed always positive, fix house error message

ReallifeGamemode.Server/Commands/AdminCommands.cs

@@ -2283,6 +2283,12 @@ namespace ReallifeGamemode.Server.Commands
         return;
       }
 
+      if(modifier < 0)
+      {
+        ChatService.ErrorMessage(player, "Es muss positives Adminspeed angegeben werden");
+        return;
+      }
+
       player.Vehicle.SetSharedData("vehicleAdminSpeed", modifier);
     }
 
@@ -2637,7 +2643,7 @@ namespace ReallifeGamemode.Server.Commands
       {
         if (!int.TryParse(option2, out int price))
         {
-          ChatService.ErrorMessage(player, "~m~Benutzung: ~s~/house price [Price]");
+          ChatService.SendMessage(player, "~m~Benutzung: ~s~/house price [Price]");
           return;
         }