[HELP] Build error C+ Plus Emulator

[Cen0n]

I have a plus original emulator, but when I try to do it with Build My translated commands happens some errors as ->

1>C:\Users\Administrador\Desktop\PlusEMU\Communication\Encryption\KeyExchange\DiffieHellman.cs(32,48,32,58): error CS0246: The type or namespace name 'BigInteger' could not be found (are you missing a using directive or an assembly reference?)

1>C:\Users\Administrador\Desktop\PlusEMU\Communication\Encryption\HabboEncryptionV2.cs(57,23,57,33): error CS0246: The type or namespace name 'BigInteger' could not be found (are you missing a using directive or an assembly reference?)

1>C:\Users\Administrador\Desktop\PlusEMU\Communication\Encryption\Crypto\RSA\RSAKey.cs(276,21,276,31): error CS0246: The type or namespace name 'BigInteger' could not be found (are you missing a using directive or an assembly reference?)

1>C:\Users\Administrador\Desktop\PlusEMU\Communication\Packets\Incoming\Navigator\GetNavigatorFlatsEvent.cs(10,7,10,32): warning CS0105: The using directive for 'Plus.HabboHotel.Navigator' appeared previously in this namespace

1>C:\Users\Administrador\Desktop\PlusEMU\Communication\Packets\Incoming\Rooms\Settings\SaveRoomSettingsEvent.cs(14,7,14,32): warning CS0105: The using directive for 'Plus.HabboHotel.Navigator' appeared previously in this namespace

1>C:\Users\Administrador\Desktop\PlusEMU\Communication\Packets\Outgoing\Navigator\UserFlatCatsComposer.cs(7,7,7,32): warning CS0105: The using directive for 'Plus.HabboHotel.Navigator' appeared previously in this namespace

1>C:\Users\Administrador\Desktop\PlusEMU\Communication\Packets\Outgoing\Navigator\NavigatorFlatCatsComposer.cs(2,7,2,32): warning CS0105: The using directive for 'Plus.HabboHotel.Navigator' appeared previously in this namespace

1>C:\Users\Administrador\Desktop\PlusEMU\Communication\Packets\Incoming\Navigator\GetUserFlatCatsEvent.cs(11,7,11,32): warning CS0105: The using directive for 'Plus.HabboHotel.Navigator' appeared previously in this namespace

1>C:\Users\Administrador\Desktop\PlusEMU\Utilities\Enclosure\GameField.cs(4,7,4,12): error CS0246: The type or namespace name 'Astar' could not be found (are you missing a using directive or an assembly reference?)

Some errors are repeated several times, could help me find the solution? please.
I've tried various versions of Plus and errors remain the same.