[Ethereum] Transaction not going through in Mist 0.8.6

mist

I have update Mist-wallet to latest 0.8.6 version and I was trying to execute a contract on my Test-network before working on Public net with this version. When I execute contract with fee suggested by Mist, it says

It seems your transaction will fail. If you submit it, it may consume all the gas you send.

I even provided the max available fee in Mist i.e 1.0541272 ether, And on confirmation page I see provide max fee as 0.02550988 ether (121000 gas). But still getting hit by same error message on confirmation page.

Best Answer

This is normally an error detected by the eth.estimateGas(...) function call, where this call returns back a result that gasUsed==gas as you have found in your answer to How to estimate gas for a function without any input parameter?.

You can see the Mist error message at mist.en.i18n.json#L193:

"estimatedGasError": "It seems this transaction will fail. If you submit it, it may consume all the gas you send.",

And this estimatedGasError error message is displayed by the code at sendTransactionConfirmation.html#L56-L66:

{{#if transactionInvalid}}
    <p class="info dapp-error"> {{{i18n "mist.popupWindows.sendTransactionConfirmation.estimatedGasError"}}} </p>
{{else}}
...
{{/if}}

The transactionInvalid status is computed by the code at sendTransactionConfirmation.js#L259-L263:

'transactionInvalid': function() {
    return TemplateVar.get('estimatedGas') == 'invalid' 
            || TemplateVar.get('estimatedGas') == 0
            || typeof TemplateVar.get('estimatedGas') == 'undefined';
}

You may want to check your smart contract code to work out why the an error is being thrown.

Related Solutions

[Ethereum] How to catch out of gas exception

Solidity didn't offer an exception management mechanism as try/catch (for Java/c#).

due to an invalid EVM code, throw consumes all provided gas terminates and reverts all changes to the state made by current contract execution and to Ether balances. this concept intends to prevent spamming the network.

in the Yellow paper it is mentioned that :

Just as with contract creation, if the execution halts in an exceptional fashion (i.e. due to an exhausted gas supply, stack underflow, invalid jump destination or invalid instruction), then no gas is refunded to the caller and the state is reverted to the point immediately prior to balance transfer (i.e. σ)

as an information for the “intrinsic gas too low” message

Mist checks the amount gas without executing any code and it tells you that the transaction will fail because you didn't provide enough gas to execute the transaction.

[Ethereum] Mist Testnet error “it seems this transaction will fail”

You can't send ether to this constructor or it will fail by design. If you want the opposite behavior then you specify the keyword "payable" in the function. It helps prevent errant transactions sending ether to contracts with no hope of recovering it.

Hope it helps.

UPDATE:

Example for clarity.

pragma solidity ^0.4.2;
contract Example {

   string public brandName;

   function Example(string yourCompanyName) payable { // <--- here    
       brandName = yourCompanyName;
   }

}

As eluded to earlier, there is no way to make the contract send ether, so any funds deposited there are marooned. We could fix that with a simple indiscriminate withdraw function.

function withdraw(uint amount) public returns(bool success) {
   if(!msg.sender.send(amount) throw;
   return true;
}

Best Answer

Related Solutions

[Ethereum] How to catch out of gas exception

[Ethereum] Mist Testnet error “it seems this transaction will fail”

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