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I entered the command correctly but I am still getting this error:

TypeError: Cannot read property 'call' of undefined at evalmachine.:1:19 
at ContextifyScript.Script.runInContext (vm.js:35:29) 
at Object.exports.runInContext (vm.js:67:17) at TruffleInterpreter.interpret (/usr/lib/node_modules/truffle/lib/repl.js:99:17) 
at bound (domain.js:280:14) at REPLServer.runBound [as eval] (domain.js:293:12) 
at REPLServer. (repl.js:545:10) at emitOne (events.js:96:13) 
at REPLServer.emit (events.js:188:7) at REPLServer.Interface._onLine (readline.js:239:10)

I would really appreciate some help on the matter.

Ahmed Hamadto
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1 Answers1

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Truffle uses Promises to handle asynchrony, that is why deployed() returns promise, not a contract instance.

So you need .then() to get instance:

HelloWorld.deployed().then(hello => console.log(hello.balance.call()))

Or you can expose contract instance as a global variable:

let hello;
HelloWorld.deployed().then(res => hello = res);
hello.balance.call();

If you see HelloWorld has not been deployed error message then try to run truffle migrate or truffle migrate --reset before jumping to console.

Relevant Truffle doc page.

max taldykin
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