Error "StorageDepositLimitExhausted" occurs when trying to mint

But I don't know why this error happens

The code is here

#![cfg_attr(not(feature = "std"), no_std)]
pub mod my_psp22 {
    // imports from openbrush
    use openbrush::traits::Storage;
    use openbrush::contracts::psp22::extensions::mintable::*;

    #[derive(Default, Storage)]
    pub struct Contract {
        psp22: psp22::Data,
    // Section contains default implementation without any modifications
    impl PSP22 for Contract {}
    impl PSP22Mintable for Contract {}
    impl Contract {
        pub fn new(initial_supply: Balance) -> Self {
            let mut _instance = Self::default();
            _instance._mint_to(_instance.env().caller(), initial_supply).expect("Should mint"); 
        pub fn mint_to(&mut self, account: AccountId, amount: Balance) -> Result<(), PSP22Error> {
            self.mint(account, amount)

When I execute "mint_to" message by the caller of contract executed account, it's OK enter image description here

But when I execute "mint_to" message by the caller of the other account, the error occurs.

enter image description here

I don't understand why this error happen.

I would be glad if someone could tell me what it is.

  • Does the calling account (test2) have enough funds?
    – forgetso
    Commented Mar 7, 2023 at 12:02

1 Answer 1


The error likely happens because your test2 account does not have enough funds to pay for the storage deposit.

For pallet-contracts / ink! the caller always needs to pay a deposit for any storage that will be created on-chain with the invoked message. This deposit is returned to whoever frees up the storage again.

You should check in polkadot-js if your account has enough funds.

  • 1
    Thank you! Your answer is correct! You're a big help, thank you!
    – 2020 yuki
    Commented Apr 17, 2023 at 5:05

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