Declaration error using SimpleStorage

[mart-cervants]

Hello, I have this error when running StorageFactory.sol, any idea what's the problem?

from solidity:
contracts/StorageFactory.sol:19:80: DeclarationError: Undeclared identifier.
SimpleStorage simpleStorage = SimpleStorage(address(simpleStorageArray[_simpleStorageIndex]));
^-----------------^

and the program is the following:

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "./SimpleStorage.sol";

contract StorageFactory is SimpleStorage{

SimpleStorage[] public simpleStorageArray;

function createSimpleStorageContract() public {
    SimpleStorage simpleStorage = new SimpleStorage();
    simpleStorageArray.push(simpleStorage);
}

function sfStore(uint256 _simpleStorage, uint256 _simpleStorageNumber) public {
    // Address
    // ABI
    SimpleStorage simpleStorage = SimpleStorage(address(simpleStorageArray[_simpleStorageIndex])); 
    simpleStorage.store(_simpleStorageNumber);

    // Simplified
    //SimpleStorage(address(simpleStorageArray[_simpleStorageIndex])).store(_simpleStorageNumber);
}

function sfGet(uint256 _simpleStorageIndex) public view returns (uint256) {
    SimpleStorage simpleStorage = SimpleStorage(address(simpleStorageArray[_simpleStorageIndex]));
    return simpleStorage.retrieve();

    // Simplified
    //return SimpleStorage(address(simpleStorageArray[_simpleStorageIndex])).simpleStorage.retrieve();
}

}

[n4n0b1t3]

in sfStore you are using the function parameter _simpleStorageNumber and not _simpleStorageIndex

in case you are using remix there should be a red marker on the left side of the editor pane at the height of this line. Hover with your mouse over it and you will see the error.

[mart-cervants]

thanks, you're right .

I didnt see that.