i'm getting this erreur with my metamask, RPC Error: Internal JSON-RPC error

Question

I am getting this error when i trying to use metamask on my gancache local for a simple transaction Metamask is connected to my ganache this is the erreur

and this is how i called my methode

packItem: function (event) {
    event.preventDefault();
    var processId = parseInt($(event.target).data('id'));

    App.contracts.SupplyChain.deployed().then(function (instance) {
        return instance.packItem(App.upc, { from: App.metamaskAccountID });
    }).then(function (result) {
        $("#ftc-item").text(result);
        console.log('packItem', result);
    }).catch(function (err) {
        console.log(err.message);
    });
},

Answer 1

You are using the wrong account to access "this item". this has nothing to do with Metamask or any code error.

you simply don't have the rights for a specific item on the smart contract you are calling and the contract is reverting the transaction with the error you are seeing.

It looks like a code error because web3 or the lib you are using, handles all transaction errors the same, whether it's underfunding or bad data or general assertions in the smart contract, all the same way.