The method eth_sendTransaction does not exist/is not available [duplicate]

Question

I am trying to send the args on function from owner account but getting Returned error.

I am using web3 1.0 .

Function in contract :

/**
* @dev Adds single address to whitelist.
* @param trusted Address to be added to the whitelist
*/
function addToWhiteList(address trusted) public onlyOwner {
    require(!whitelist[trusted]);
    whitelist[trusted] = true;

    emit UserWhitelist(true);
}

Code on index.html :

// Add user on whitelist
abc.methods.addToWhiteList("0x9DA80947ACf5Fc16299311EdAabc37fF7d201C95")
.send({ from: "0x61A44075419C4402f6DE631341d875Ece6A3922e" })
.on("receipt", function(receipt) {
  console.log(receipt);
})
.on("error", function(error) {
  console.error(error);
});

ERROR : Returned error: The method eth_sendTransaction does not exist/is not available

Note : I add web3 in script tag :

<script language="javascript" type="text/javascript" src="web3.min.js"></script>

and init. like this :

web3 = new Web3(new Web3.providers.WebsocketProvider("wss://ropsten.infura.io/ws"));

Answer 1

I am not sure if this is the reason. But try unlockking account before sending transaction. The senders account needs to be unlocked. Generally you get please unlock your account error. But may be this is not allowing you to send tx. A sample code looks like:

    custom_func.prototype.SENDCNK=function(from,to,password,amount){
    return new Promise(function(fullfill,reject){
        /* add basic checks like if user has sufficient balance , address are valid etc*/
        web3.eth.personal.unlockAccount(from, password).then(function(result,e){
            console.log("Account "+from+" unlocked successfully");
            amount = parseFloat(amount);
            amount = amount *decimalMultiplier;
            cnkContract.methods.transfer(to ,amount).send({from:from})
                .on('transactionHash',function(txHash){
                    console.log("Transaction hash : "+txHash);
                    fullfill(txHash);
                }).catch(function(error){
                    console.log("Unable to send transaction. Error:"+error);
                    logger.error(error);
                    reject("Sending transaction on blockchain failed");
                });        
       }).catch(function(error){
            logger.error("Incorrect transaction password for account: "+from);
            reject("Incorrect transaction password.");
       });
    });    
}