Is there a way to call a contract with no arguments using async? Contract code:

contract A {
     function test() constant returns(string s, address addr) {
        s = "Success!";
        addr = msg.sender;

Here is the js code:

        function getResult(cb) {
      contractObject = web3.eth.contract(abi);
            contractInstance = contractObject.at(address);

  function(err,getOutput) {
       if(err) {console.log(err);}
       var gotOutput = getOutput;
       console.log('Test result received: ' + getOutput);
    return cb(null,gotOutput);
    ], function asyncComplete(err, getResult) {
        if (err) {console.log(err);}
        var result = [];
        result.push({ result: getResult[0], address: getResult[1]});

The error I am currently seeing when I execute the above code against testrpc, is

BigNumber Error: new BigNumber() not a base 16 number:

Any suggestions on how to get around this error?

  • Related and might have a helpful hint: ethereum.stackexchange.com/questions/1741/…
    – eth
    Commented Dec 5, 2016 at 0:10
  • hanks for the comment - blockchain syncing i am not sure is an issue - since i am using the testrpc and i wonder, if there could be issues around that. however, on the other hand, would you think that the issue is with type of variable being passed in - should be string instead or a bytestream of the string?
    – skarred14
    Commented Dec 5, 2016 at 1:07

1 Answer 1


This is a decoding bug in web3.js. I assume it has to do with the string decoding.

Please submit an issue in the web3 repo. I will look at this in the 1.0 branch

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