Type address is not implicitly convertible to expected type contract ERC20

I am trying to compile my crowdsale contract and get this error:

" TypeError: Type address is not implicitly convertible to expected
type contract ERC20.
token = 0x0f26c1c05f1bbBC7Eff0488F1a98619e8a9758cf; "
^----------------------------------------^


I suppose putting this address type is wrong, maybe I should remove smth or add smth, can you please help me? I copied my address from ropsten.ether.scan

Thanks in advance!

pragma solidity ^0.4.24;

import "openzeppelin-solidity/contracts/token/ERC20/ERC20.sol";
import "openzeppelin-solidity/contracts/math/SafeMath.sol";
import "openzeppelin-solidity/contracts/token/ERC20/SafeERC20.sol";


/**
* @title Crowdsale
* @dev Crowdsale is a base contract for managing a token crowdsale,
* allowing investors to purchase tokens with ether. This contract implements
* such functionality in its most fundamental form and can be extended to provide additional
* functionality and/or custom behavior.
* The external interface represents the basic interface for purchasing tokens, and conform
* the base architecture for crowdsales. They are *not* intended to be modified / overridden.
* The internal interface conforms the extensible and modifiable surface of crowdsales. Override
* the methods to add functionality. Consider using 'super' where appropriate to concatenate
* behavior.
*/
contract Crowdsale
using SafeMath for uint256;
using SafeERC20 for ERC20;

// The token being sold
ERC20 public token;

// Address where funds are collected
address public wallet;

// How many token units a buyer gets per wei.
// The rate is the conversion between wei and the smallest and indivisible token unit.
// So, if you are using a rate of 1 with a DetailedERC20 token with 3 decimals called TOK
// 1 wei will give you 1 unit, or 0.001 TOK.
uint256 public rate;

// Amount of wei raised
uint256 public weiRaised;

/**
* Event for token purchase logging
* @param purchaser who paid for the tokens
* @param beneficiary who got the tokens
* @param value weis paid for purchase
* @param amount amount of tokens purchased
*/
event TokenPurchase(
address indexed purchaser,
address indexed beneficiary,
uint256 value,
uint256 amount
);

/**
* @param _rate Number of token units a buyer gets per wei
* @param _wallet Address where collected funds will be forwarded to
* @param _token Address of the token being sold
*/
constructor(uint256 _rate, address _wallet, ERC20 _token) public
require(_rate > 0);
require(_wallet != address(0));
require(_token != address(0));

rate = 8 * (10**8);
wallet = 0xF76075Cf3B674fB9656E393e9e17091B01243666;
token = 0x0f26c1c05f1bbBC7Eff0488F1a98619e8a9758cf;


// -----------------------------------------
// Crowdsale external interface
// -----------------------------------------

/**
* @dev fallback function ***DO NOT OVERRIDE***
*/
function () external payable
buyTokens(msg.sender);


/**
* @dev low level token purchase ***DO NOT OVERRIDE***
* @param _beneficiary Address performing the token purchase
*/
function buyTokens(address _beneficiary) public payable

uint256 weiAmount = msg.value;
_preValidatePurchase(_beneficiary, weiAmount);

// calculate token amount to be created
uint256 tokens = _getTokenAmount(weiAmount);

// update state
weiRaised = weiRaised.add(weiAmount);

_processPurchase(_beneficiary, tokens);
emit TokenPurchase(
msg.sender,
_beneficiary,
weiAmount,
tokens
);

_updatePurchasingState(_beneficiary, weiAmount);

_forwardFunds();
_postValidatePurchase(_beneficiary, weiAmount);


// -----------------------------------------
// Internal interface (extensible)
// -----------------------------------------

/**
* @dev Validation of an incoming purchase. Use require statements to revert state when conditions are not met. Use `super` in contracts that inherit from Crowdsale to extend their validations.
* Example from CappedCrowdsale.sol's _preValidatePurchase method:
* super._preValidatePurchase(_beneficiary, _weiAmount);
* require(weiRaised.add(_weiAmount) <= cap);
* @param _beneficiary Address performing the token purchase
* @param _weiAmount Value in wei involved in the purchase
*/
function _preValidatePurchase(
address _beneficiary,
uint256 _weiAmount
)
internal

require(_beneficiary != address(0));
require(_weiAmount != 0);


/**
* @dev Validation of an executed purchase. Observe state and use revert statements to undo rollback when valid conditions are not met.
* @param _beneficiary Address performing the token purchase
* @param _weiAmount Value in wei involved in the purchase
*/
function _postValidatePurchase(
address _beneficiary,
uint256 _weiAmount
)
internal

// optional override


/**
* @dev Source of tokens. Override this method to modify the way in which the crowdsale ultimately gets and sends its tokens.
* @param _beneficiary Address performing the token purchase
* @param _tokenAmount Number of tokens to be emitted
*/
function _deliverTokens(
address _beneficiary,
uint256 _tokenAmount
)
internal

token.safeTransfer(_beneficiary, _tokenAmount);


/**
* @dev Executed when a purchase has been validated and is ready to be executed. Not necessarily emits/sends tokens.
* @param _beneficiary Address receiving the tokens
* @param _tokenAmount Number of tokens to be purchased
*/
function _processPurchase(
address _beneficiary,
uint256 _tokenAmount
)
internal

_deliverTokens(_beneficiary, _tokenAmount);


/**
* @dev Override for extensions that require an internal state to check for validity (current user contributions, etc.)
* @param _beneficiary Address receiving the tokens
* @param _weiAmount Value in wei involved in the purchase
*/
function _updatePurchasingState(
address _beneficiary,
uint256 _weiAmount
)
internal

// optional override


/**
* @dev Override to extend the way in which ether is converted to tokens.
* @param _weiAmount Value in wei to be converted into tokens
* @return Number of tokens that can be purchased with the specified _weiAmount
*/
function _getTokenAmount(uint256 _weiAmount)
internal view returns (uint256)

return _weiAmount.mul(rate);


/**
* @dev Determines how ETH is stored/forwarded on purchases.
*/
function _forwardFunds() internal
wallet.transfer(msg.value);




2 Answers
2

Change

token = 0x0f26c1c05f1bbBC7Eff0488F1a98619e8a9758cf;


To

token = ERC20(0x0f26c1c05f1bbBC7Eff0488F1a98619e8a9758cf);


token is of type ERC20, and you are trying to assign it a value of type address. You need to explicitly cast it.

token

ERC20

address

I think we need to explicit cast the address to ERC20 token contract as below

token = ERC20(0x0f26c1c05f1bbBC7Eff0488F1a98619e8a9758cf);


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