Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'Contract') at flip

Moralis General
#1

When I use the code I got this error “Uncaught (in promise) TypeError: Cannot read properties of undefined (reading ‘Contract’) at flip” .
How can I solve it ? I new to coding. Can you please explain the answer for a newbie :slight_smile:

async function flip(side){
let sideNumber;
if(side == “heads”)
sideNumber = 0;
else
sideNumber = 1;

let amount = document.getElementById("amount").value;

window.web3 = await Moralis.enableWeb3();
let contractInstance = new web3.eth.Contract(window.abi, "0xCDC5Dd9176A9D23eAE6d199E0ddDd77C4602B30B")
contractInstance.methods.flip(sideNumber).send({value: amount, from: ethereum.selectedAddress})
.on('receipt', function(receipt){
  console.log(receipt);
})
#2

it may be because when that tutorial was made moralis SDK was using web3 by default and now it is using ethers

you could try to use Moralis SDK version 0.0.184

#3

how can I use Moralis SKD version 0.0.184 ?

#4

you add something like this in your html header instead of what you have now for Moralis SDK

<script src="https://unpkg.com/[email protected]/dist/moralis.js"></script>
#5

Yes… Thank you mate. It is working now…
Is it hard to update the code for ethers?

#6

you can read here about that migration to ethers for Moralis SDK: