Not a contract address

[mindfu]

Getting this error while working on Video 63:

Uncaught (in promise) Error: Attempting to run transaction which calls a contract function, but recipient address 0xc9301a4af7c3e531293ae3539dcecfef2507db40 is not a contract address
at Object.InvalidResponse (web3.min.js:1)
at web3.min.js:2
at XMLHttpRequest.n.onreadystatechange (web3.min.js:2)
InvalidResponse @ web3.min.js:1
(anonymous) @ web3.min.js:2
n.onreadystatechange @ web3.min.js:2
Promise.then (async)
render @ app.js:76
(anonymous) @ app.js:43
i @ jquery.min.js:2
fireWith @ jquery.min.js:2
y @ jquery.min.js:4
c @ jquery.min.js:4
XMLHttpRequest.send (async)
send @ jquery.min.js:4
ajax @ jquery.min.js:4
n.(anonymous function) @ jquery.min.js:4
getJSON @ jquery.min.js:4
(anonymous) @ app.js:37
i @ jquery.min.js:2
fireWith @ jquery.min.js:2
y @ jquery.min.js:4
c @ jquery.min.js:4
XMLHttpRequest.send (async)
send @ jquery.min.js:4
ajax @ jquery.min.js:4
n.(anonymous function) @ jquery.min.js:4
getJSON @ jquery.min.js:4
initContracts @ app.js:30
initWeb3 @ app.js:26
init @ app.js:12
(anonymous) @ app.js:102
dispatch @ jquery.min.js:3
r.handle @ jquery.min.js:3
load (async)
add @ jquery.min.js:3
(anonymous) @ jquery.min.js:3
each @ jquery.min.js:2
each @ jquery.min.js:2
sa @ jquery.min.js:3
on @ jquery.min.js:3
(anonymous) @ bootstrap.min.js:6
(anonymous) @ bootstrap.min.js:6

Any idea about this one?

[AnaMariaNanes]

@mindfu You should make some changes:

1. In DappTokenSale.sol:
   function endSale() public {
   require(msg.sender == admin);
   require(tokenContract.transfer(admin, tokenContract.balanceOf(address(this))));
   admin.transfer(address(this).balance);
   }

2. In the test file DappTokenSale.js this is the entire test for the endSale() method:
   it('ends token sale', function() {
   return DappToken.deployed().then(function(instance) {
   // Grab token instance first
   tokenInstance = instance;
   return DappTokenSale.deployed();
   }).then(function(instance) {
   // Then grab token sale instance
   tokenSaleInstance = instance;
   // Try to end sale from account other than the admin
   return tokenSaleInstance.endSale({ from: buyer });
   }).then(assert.fail).catch(function(error) {
   assert(error.message.indexOf('revert') >= 0, 'must be admin to end sale');
   // End sale as admin
   return tokenSaleInstance.endSale({ from: admin });
   }).then(function(receipt) {
   return tokenInstance.balanceOf(admin);
   }).then(async function(balance) {
   assert.equal(balance.toNumber(), 999990, 'returns all unsold dapp tokens to admin');
   // Check that the contract has no balance
   await web3.eth.getBalance(tokenSaleInstance.address)
   .then(contract_balance => assert.equal(contract_balance, 0));
   });
   });

!!!! async and await are necessary because calls to web3.eth return a promise and not a value straigtforward.