Ethereum: Undeclared Identifier `_disableInitializers();`

I see what’s going on. The error message is quite clear:

Error (7576): Undeclared identifier

   --> src/BoxV1.sol:32:9:

   |

32 |         _disableInitializers();

The issue is that you’re trying to access a function DisableInitializers without defining it anywhere in your code. The correct definition for this function should be included in the same file or imported from another module.

Assuming DisableInitializers is a custom function defined elsewhere, here’s how you can fix the error:

• Add the necessary import statement:

pragma solidity ^0.8.0;

import "./BoxV1.sol";

This imports the BoxV1 contract from another file.

• Define the DisableInitializers function:

function _disableInitializers() external {

    // implementation of DisableInitializers

}

Note that I’ve used a different naming convention for the function here, but it should match the one defined in the imported contract (BoxV1.sol).

• Update your code to use DisableInitializers:

//SPDX-License-Identifier: MI

pragma solidity ^0.8.0;


import "./BoxV1.sol";


function DisableInitializers() external {

    _disableInitializers();

}

This should resolve the error and allow your code to compile successfully.

Example use case:

You can now call DisableInitializers on an instance of BoxV1, like this:

contract BoxV1 {

    function BoxV1() public {

        // initialize everything here...

    }


    function DisableInitializers() external {

        _disableInitializers();

    }

}

With this updated code, you should be able to compile and run your contract without encountering the Undeclared identifier error.

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