Latest questions in Blockchain

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1 answer

Variable declaration problem in truffle console.

The reason it says “undefined” is because ...READ MORE

Jan 27, 2019 in Blockchain by Omkar
• 69,230 points
1,156 views
0 votes
1 answer

How to create custom accounts in testrpc?

Yes, you can use testrpc to do ...READ MORE

Jan 27, 2019 in Blockchain by Omkar
• 69,230 points
506 views
0 votes
0 answers
0 votes
1 answer

Calling Truffle Commands through a script

Seems like its due to async behavior ...READ MORE

Jan 25, 2019 in Blockchain by Omkar
• 69,230 points
1,165 views
0 votes
1 answer

How to run a Javascript in truffle console?

There are two ways to do this. You ...READ MORE

Jan 24, 2019 in Blockchain by Omkar
• 69,230 points
2,226 views
0 votes
1 answer

How to call a payable contract function from truffle console?

You can use a contract function, on ...READ MORE

Jan 24, 2019 in Blockchain by Omkar
• 69,230 points
2,369 views
0 votes
1 answer

Truffle dev says my function is not a function

It seems you are using truffle v5. ...READ MORE

Jan 24, 2019 in Blockchain by Omkar
• 69,230 points
1,994 views
0 votes
0 answers

WA: With the wings of the technology, constantly broadening the field of development

According to the history, in the Internet ...READ MORE

Jan 24, 2019 in Blockchain by anonymous

recategorized Jan 24, 2019 by Vardhan 306 views
0 votes
0 answers

How does Atox debut in the center of cross-border payment industry?

Introduction: The “global village” created by the ...READ MORE

Jan 24, 2019 in Blockchain by anonymous

recategorized Jan 24, 2019 by Vardhan 373 views
0 votes
1 answer

Solidity Error: Exceeds block gas limit

Remove the line norpc:true and change the ...READ MORE

Jan 24, 2019 in Blockchain by Omkar
• 69,230 points
2,667 views
0 votes
1 answer

Truffle can not find artifacts error

To deploy any project/ smart contract, you ...READ MORE

Jan 24, 2019 in Blockchain by Omkar
• 69,230 points
4,708 views
0 votes
1 answer

truffle migrate Error: “Cannot find module 'truffle-expect'”

Seems like you are missing some modules ...READ MORE

Jan 24, 2019 in Blockchain by Omkar
• 69,230 points
1,100 views
0 votes
1 answer

Unexpected error: Cannot provision contracts while instantiating the console

This is a common problem with truffle ...READ MORE

Jan 23, 2019 in Blockchain by Omkar
• 69,230 points
669 views
0 votes
1 answer

Not able to install truffle-contract

There’s a permission error. Run this command ...READ MORE

Jan 23, 2019 in Blockchain by Omkar
• 69,230 points
1,991 views
0 votes
1 answer

Solidity: casting address to address payable

I don’t see why direct casting isn’t ...READ MORE

Jan 23, 2019 in Blockchain by Omkar
• 69,230 points
7,703 views
0 votes
1 answer

Error while sending an address to functions

In solidity 0.5.0 (and above) there are ...READ MORE

Jan 23, 2019 in Blockchain by Omkar
• 69,230 points
3,005 views
0 votes
1 answer

Not able to use ERC721 token in my project

Like this error indicates, you have to ...READ MORE

Jan 23, 2019 in Blockchain by Omkar
• 69,230 points
640 views
0 votes
1 answer

'env' is not recognized as an internal or external command

According to the error, it seems like ...READ MORE

Jan 23, 2019 in Blockchain by Omkar
• 69,230 points
14,789 views
0 votes
1 answer

How can I call a contract from another contract?

There are two ways to solve this. ...READ MORE

Jan 23, 2019 in Blockchain by Omkar
• 69,230 points
1,590 views
0 votes
0 answers

AXC: Conform to the trend of the times and to be a pioneer in the development of the industry

On January 2, 2019, Ali Baba DAMO ...READ MORE

Jan 23, 2019 in Blockchain by anonymous

retagged Jan 23, 2019 by Vardhan 677 views
–1 vote
2 answers

Can I add extra miners to an Ethereum Private Network?

To add miners, add peers. Then with ...READ MORE

Feb 19, 2019 in Blockchain by Rahul
1,127 views
–1 vote
1 answer

Problem adding peers to Ethereum private network

Seems like you have not created the ...READ MORE

Jan 23, 2019 in Blockchain by Omkar
• 69,230 points
2,303 views
0 votes
1 answer

How to add peer to ethereum private network?

To connect a node to already existing ...READ MORE

Jan 22, 2019 in Blockchain by Omkar
• 69,230 points
2,784 views
0 votes
1 answer

Problem monitoring geth instance

Try the following command: geth monitor --attach ./chain-data/geth.ipc ...READ MORE

Jan 22, 2019 in Blockchain by Omkar
• 69,230 points
561 views
0 votes
0 answers

AtoX leads blockchain 4.0

Since Satoshi Nakamoto created bitcoin in 2008, ...READ MORE

Jan 21, 2019 in Blockchain by TONGZHENG

retagged Jan 24, 2019 by Omkar 692 views
–1 vote
1 answer

Truffle migrate network error

When you are running truffle on a ...READ MORE

Jan 18, 2019 in Blockchain by Omkar
• 69,230 points
635 views
–1 vote
2 answers

Truffle migrate not deploying contract.

truffle migrate --reset READ MORE

May 12, 2020 in Blockchain by Jason Romero
8,890 views
–1 vote
2 answers

Truffle migrate shows Error: Cannot find module 'truffle-expect'

You can also install the basic truffle-expect ...READ MORE

Feb 19, 2019 in Blockchain by Rohit
810 views
0 votes
1 answer

Not able to deploy smart contract to private network

This could happen due to 3 possible ...READ MORE

Jan 18, 2019 in Blockchain by Omkar
• 69,230 points
841 views
0 votes
1 answer

Testrpc can't find log handlers

This doesn't usually happen, maybe the log ...READ MORE

Jan 18, 2019 in Blockchain by Omkar
• 69,230 points
638 views
0 votes
1 answer

Truffle migrate Server Error

Seems like truffle didn't find a server. ...READ MORE

Jan 18, 2019 in Blockchain by Omkar
• 69,230 points
384 views
0 votes
1 answer

Truffle "Migrations" ran out of gas error

This error is caused because the amount ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
• 69,230 points
3,934 views
0 votes
1 answer

"Migrations" exceeded the block limit (with a gas value you set).

In the error you have posted, in ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
• 69,230 points
5,705 views
0 votes
1 answer

"Migrations" -- Returned error: authentication needed: password or unlock.

By default, the accounts are locked and ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
• 69,230 points
4,060 views
0 votes
1 answer

Truffle compile compilation failed

This is a version compatibility problem. In ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
• 69,230 points
3,469 views
0 votes
2 answers

Truffle compile: SyntaxError: No visibility specified. Did you intend to add "public"?

You can try another method : contract HelloWorld{       function ...READ MORE

Mar 18, 2019 in Blockchain by anonymous
3,668 views
–1 vote
1 answer

Not able to compile truffle project

Hi. If you look at the error ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
• 69,230 points
1,674 views
–1 vote
1 answer

Not able to install truffle

I know this is very frustrating, I ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
• 69,230 points
3,760 views
–1 vote
1 answer

Miner in Ethereum Private network is hanging

Looking at your commands again, I figured ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
• 69,230 points
1,637 views
–1 vote
1 answer

Not able to create new account in geth for private ethereum blockchain

personal.newAccount() is not a default geth method. This ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
• 69,230 points
3,481 views
–1 vote
1 answer

Not able to use geth attach

You are getting this error because you ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
• 69,230 points
5,061 views
–1 vote
1 answer

geth attach Fatal: Unable to attach to remote geth: no known transport for URL scheme "c"

Seems like geth.ipc path is not set. When ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
• 69,230 points
1,857 views
–1 vote
1 answer

How to get pending transaction in geth?

You can check the pending transactions using ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
• 69,230 points
3,626 views
–1 vote
1 answer

Geth miner not working

Hi. miner.start() gives no output. So, when the output ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
• 69,230 points
2,332 views
–1 vote
1 answer

setEtherbase() not working in geth

setEtherbase() is not a method of the personal ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
• 69,230 points
1,363 views
0 votes
1 answer

geth attach command showing error: bind: address already in use

Seems like there is already a geth instance ...READ MORE

Jan 16, 2019 in Blockchain by Omkar
• 69,230 points
2,358 views
0 votes
2 answers

“geth attach” command shows error: Fatal: Unable to attach to remote geth

please check from root, sudo -i geth attach READ MORE

Nov 7, 2020 in Blockchain by balachandar
• 140 points
6,739 views
0 votes
1 answer

Not able to connect to Ethereum node in web browser

By default, geth listens only to localhost. ...READ MORE

Jan 16, 2019 in Blockchain by Omkar
• 69,230 points
1,776 views
0 votes
1 answer

How to sync private nodes in geth and testRPC locally?

HI. As much as I know, running ...READ MORE

Jan 16, 2019 in Blockchain by Omkar
• 69,230 points
1,139 views
0 votes
1 answer

geth personal.newAccount() shows password error

You have to pass the password as ...READ MORE

Jan 16, 2019 in Blockchain by Omkar
• 69,230 points
827 views