title: TypeError: Cannot read property 'eth' of undefined
body: <p>So I have this problem with this code and cant seem to figure out why i am getting this error when I run the script with the terminal:</p>
  <pre><code>(node:30800) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'eth' of undefined
  </code></pre>
  <pre><code>const Web3 = require('web3');
  
  class TransactionChecker{
      web3;
      account;
  
      constuctor(projectId, account){
          this.web3 = new Web3(new Web3.providers.HttpProvider('wss://mainnet.infura.io/ws/v3/' + projectId));
          this.account = account.toLowerCase();
      }
  
      async checkBlock(){
        let block = await this.web3.eth.getBlock('latest');
        let number = block.number;
        console.log('Searching block ' + number);
  
        if (block != null &amp;&amp; block.transactions != null){
          for (let txHash of block.transactions){
            let tx = await this.web3.eth.getTransaction(txHash);
            if (this.account == tx.to.toLowerCase()) {
              console.log('Transaction found on block: ' + number);
              console.log({address: tx.from, value: this.web3.utils.fromWei(tx.value, 'ether'), timestamp})
            }
          }
        }
      }
  }
  
  let txChecker = new TransactionChecker('6bad75506d6649428e0e34ba41d51805', '0x9cad169749bBF8a3Fd735B26C21F2C7F4D8c5383');
  txChecker.checkBlock();
  </code></pre>
  <p>Can anyone with a better understanding of this assist? Thanks.</p>