I get the following error when trying to convert my frame_system::Config::AccountId to a MultiAddress.

expected enum `MultiAddress<sp_runtime::AccountId32, ()>`
   found enum `MultiAddress<<T as frame_system::Config>::AccountId, _>`
consider constraining the associated type `<T as frame_system::Config>::AccountId` to `sp_runtime::AccountId32`

Here is the code that fails to create a MultiAddress from the AccountId.


let staker = ensure_signed(origin)?;

let location: MultiLocation = MultiLocation {
    parents: 1,
    interior: Here,

let create_nomination_pool =
                >::create {
                    amount: 10000,
                    root: MultiAddress::from(staker),
                    nominator: MultiAddress::from(staker),
                    bouncer: MultiAddress::from(staker),

Here is the type of my frame_system::Config::AccountId.

pub type AccountId = <<Signature as sp_runtime::traits::Verify>::Signer as sp_runtime::traits::IdentifyAccount>::AccountId;

1 Answer 1


You can add a trait to do this.

trait Config: frame_system::Config {
  AccountIdConvertor: AccountIdConvertor<Self::AccountId>;

trait AccountIdConvertor<A> {
  fn to_32(a: A) -> AccountId32;

fn c(origin: OriginFor<T>) {
  let a = ensure_signed(origin)?;
  let a_32 = T::AccountIdConvertor::to_u32(a);


Or you can limit only accountid32 chain can use this pallet.

trait Config: frame_system::Config<AccountId = AccountId32> {}

  • Won't I need to implement the AccountIdConverter::to_32 method for the frame_system::Config::AccountId?
    – Snowmead
    Commented Jun 1, 2023 at 18:14
  • Nope, you should define a struct at runtime level, and implement this trait for it. Finally, pass this struct to the youpallet::Config::AccountIdConvertor.
    – AurevoirXavier
    Commented Jun 3, 2023 at 0:39
  • Is there a public implementation of AccountIdConverter that we can look for reference? Commented Aug 2, 2023 at 5:55

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