I'm trying to make a web page that gets a message from a simple "hello world" smart contract. Unfortunately, it isn't working. I'm seeing this in the Mist console.

Uncaught invalid address
v                     @ web3.min.js:2
p                     @ web3.min.js:2
(anonymous function)  @ web3.min.js:2
i.formatInput         @ web3.min.js:2
i.toPayload           @ web3.min.js:2
i.buildCall.e         @ web3.min.js:2
s.sendTransaction     @ web3.min.js:2
s.execute             @ web3.min.js:2
(anonymous function)  @ (index):26

The web page is here and the contract source code is here. I can't figure out what I'm doing wrong.

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This error appears when you do not have a defaultAccount property set in the web3.eth object. Try to execute this in Javascript console:


(assuming you have some accounts created already)

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  • I've just tried that. I get: Error: Provider not set or invalid at Object.e.exports.InvalidProvider... and Uncaught TypeError: Cannot read property '0' of null at <anonymous>:2:42... – Sinking Point Mar 3 '16 at 10:06
  • How could you achieve this without explicitly setting the defaultAccount? – glider Mar 16 '16 at 8:06
  • This one worked for me. – samurai jack Apr 16 '16 at 13:16
  • Mist 9.0 Uncaught Error: No callback given, sync calls are not possible anymore in Mist. Please use only async calls. – NineCattoRules Sep 10 '17 at 15:50

According to your error, you are yet to set up the provider.

web3.setProvider(new web3.providers.HttpProvider('http://localhost:8102'));

where localhost and port refers to the ethereum server node you intend use with the Web3.

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From: https://github.com/jefflau/ens-manager/issues/36

New sync calls are not permitted on the newest versions of web3.js. As a result, the app will not detect the correct user and therefore not allow you to manage it and log an error:

Uncaught (in promise) Error: No callback given, sync calls are not possible anymore in Mist. Please use only async calls.

You should replace all



web3.eth.getAccounts(function(e,accounts){ // do something });
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