Solidity Smart Contract Development Section 2 Lesson 6

[Kuro-Labs-iu]

Hello I need help with this line of code, when I tried to deploy it output an error saying that member 'retrieve' not found even though I copied the code from the video exactly. Please help thanks.

|function sfGet(uint256 _simpleStorageIndex) public view returns (uint256){
SimpleStorage mySimpleStorage = listOfSimpleStorageContracts[_simpleStorageIndex];
return mySimpleStorage.retrieve();

    TypeError: Member "retrieve" not found or not visible after argument-dependent lookup in contract SimpleStorage.

--> StorageFactory.sol:22:16:
|
22 | return mySimpleStorage.retrieve();
| ^^^^^^^^^^^^^^^^^^^^^^^^