I've been struggling with how to do this for quite some time and hoping this community could help.

I know that it should be added or something similar, so tokens balance of the investor address can be changed after investment.

enter image description here

I tried to modify buy() in a few ways by adding this for example:

require(tokenReward.transfer(msg.sender, numTokens));
require(tokenReward.transferFrom(ASSET_MANAGER_WALLET, msg.sender, numTokens));

require(tokenReward.transferFrom(tokenReward.owner(), msg.sender, numTokens));

if (tokenReward.transferFrom(tokenReward.owner(), msg.sender, numTokens))

tokenReward.transferFrom(tokenReward.owner(), msg.sender, amount.mul(rate));

if (tokenReward.transferFrom(tokenReward.owner(), msg.sender, amount.mul(RATE))) {

if (tokenReward.transferFrom(tokenReward.owner(), msg.sender,  numTokens)) {

No success.


Without this line of code,

require(tokenReward.transferFrom(tokenReward.owner(), msg.sender, numTokens));

I could send eth and balanceOf and amountRised were CORRECTLY CALCULATED BUT THE INVESTOR BALANCE WAS NOT CORRECT.

After adding this line of code, require(tokenReward.transferFrom(tokenReward.owner(), msg.sender, numTokens)); I can not do anything. When sending eth to crowdsale, I get this from Myetherwallet, enter image description here

Is there anyone here who could help solve this problem. Thank you, Robert

Token Contract

Crowdsale Contract

  • You need to rephrase your question, I couldn't understand what is your problem, you say too many things but nowhere your problem is stated clearly, for instance buy() function should be in the body of your question. – Jaime Jun 1 '18 at 14:41
  • Hi, why can't send eth to crowdsale contract after adding a line require(tokenReward.transferFrom(tokenReward.owner(), msg.sender, numTokens)); – Robert Jun 1 '18 at 16:13

The problem is you are using an external owned account as tokenReward.

In etherscan page of your token sale the tokenReward address is 0x79b67dff9fb21d2550937d879ec2eacb2f377da0 which is a regular non contract account.

Since you can only modify the tokenReward address in the constructor the only option left is to redeploy your sale contract.

  • Thank you for your answer. You mean deploy again the same the crowdsale contract. Can You be more specific because I do not really understand how to do it. Robert – Robert Jun 4 '18 at 9:13
  • The constructor of your token sale ParadiseTokenSale has a parameter addressOfTokenUsedAsReward that should point to your token ParadiseToken. You cannot fix it in your deployed contracts because the code doesn't allow it, you will have to redeploy them again. – Ismael Jun 4 '18 at 13:38
  • You were right. The problem was external owned account as tokenReward. I changed to ParadiseToken. It works but the investor's balance is incorrect. – Robert Jun 4 '18 at 19:42

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