Not able send ether to my smart contract s address

Question

contract_file = 'contract.sol'
contract_name = ':SimpleContract'

Solc = require('solc')
Web3 = require('web3')

web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
source_code = fs.readFileSync(contract_file).toString()

admin_account = web3.eth.accounts[0]

compiledContract = Solc.compile(source_code)
abi = compiledContract.contracts[contract_name].interface
bytecode = compiledContract.contracts[contract_name].bytecode;
ContractClass =  web3.eth.contract(JSON.parse(abi))

contract_init_data = {
    data: bytecode,
    from: admin_account,
    gas: 1000000,
}

deployed_contract = ContractClass.new(contract_init_data)
contract_instance = ContractClass.at(deployed_contract.address)

until here, this works. But the line msg.sender.transfer(amount); in my contract wouldn't compile on web3. 

I then try to add ether to the contract like this:

load_up = {
    from: admin_account, 
    to: deployed_contract.address, 
    value: web3.toWei(1, 'ether'),
}
web3.eth.sendTransaction(load_up)

and I get:

Error: VM Exception while processing transaction: invalid opcode

Answer 1

It turns out that you need to create a method on the contract with the payable keyword, for example:

function AddEth () payable {}

and then you can interact with my contract like this:

load_up = {
    from: admin_account, 
    to: deployed_contract.address, 
    value: web3.toWei(10, 'ether'),
}
deployed_contract.AddEth.sendTransaction(load_up)