Truffle – Error Code -32000 ‘Header Not Found’ When Deploying Smart Contracts on BSC

I refer to your code for ItemListContract in Unable to add new struct item into mapping or array.

The following code compiles without errors:

pragma solidity ^0.4.0;

contract ItemListContract {
    struct item {
        bytes iname;
        uint16 itemid;
        bytes icode;
        uint ivalue;
    }

    uint itemCount;
    mapping(bytes => item) itemList;
    item[] itemArray;

    function ItemListContract() {
        log0('hi');
    }

    function addItem(bytes name, uint16 iid, bytes code, uint val) {        
        var itemnew = item(name, iid ,code, val);
        // log0(itemnew);
        itemList[code] = itemnew;
        itemArray.push(itemnew);
        itemCount++;
    }

    function countItemList() constant returns (uint count) {     
        return itemCount;
    }

    function removeItem(bytes code) {
        delete itemList[code];
        itemCount--;
    }

    function getItem(bytes code) constant returns (bytes iname, uint val) {   
        return (itemList[code].iname, itemList[code].ivalue);
    }
}

contract ItemListCallerContract {

     ItemListContract itemListContract;

     function ItemListCallerContract() {
         itemListContract = ItemListContract(0x16c5d0c8fccaf7e5824f5ae25c1662877cec6452);
     }

     function getItemCount() constant returns(uint count) {
         return itemListContract.countItemList();
     }
}

In your code, the compiler will need to know the code for ItemListContract. The address for the first contract is defined without the double quotes. I also had to change the getItemCount() return type to match that of ItemListContract.countItemList().

You can also just provide the interface for the first contract without the implementation details as shown below:

pragma solidity ^0.4.0;

contract ItemListContract {

    function ItemListContract();

    function addItem(bytes name, uint16 iid, bytes code, uint val);

    function countItemList() constant returns (uint count);

    function removeItem(bytes code);

    function getItem(bytes code) constant returns (bytes iname, uint val);
}

contract ItemListCallerContract {

     ItemListContract itemListContract;

     function ItemListCallerContract() {
         itemListContract = ItemListContract(0x16c5d0c8fccaf7e5824f5ae25c1662877cec6452);
     }

     function getItemCount() constant returns(uint count) {
         return itemListContract.countItemList();
     }
}

Most mobile wallets allow interaction with smart contracts using WalletConnect protocol, so they probably assume there's no need to manually create a transaction with arbitrary data.

MetaMask used to be the exception, but the feature has been broken for years due to a trivial UI bug, and the assumption above may be the reason why they don't deem it a priority to fix it.

So no, there's currently no mobile wallet app allowing to do that.