Error: nonce too low

I try to send eth from one address to another, but I get an error:Error: Returned error: nonce too low What could be the problem? const Web3 = require(‘web3’) const web3 = new Web3(new Web3.providers.HttpProvider(‘https://mainnet.infura.io’)) var Tx = require(‘ethereumjs-tx’).Transaction; var privateKey = Buffer.from(‘private_key’, ‘hex’); var rawTx = { nonce: ‘0x000’, gasPrice: ‘0x09184e72a000’, gasLimit: ‘0x2710’, to:…

browser/demo01.sol:8:33: ParserError: Expected ‘{‘ but got ‘return’ function age() private view return (unit) ^—-^

pragma solidity ^0.4.24; //properties functions request contract AttrFnDemo{ uint private _age; string internal _name; int public _num; function age() private view return (unit) { return _age; } function age() internal return (string){ return _name; } function age() private return (int){ return _num; } }