Ethereum: Undeclared Identifier `_disableInitializers();`

I understand what is happening. The error message is pretty clear:

Error (7576): Undeclared identifier

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

   |

32 |         _disableInitializers();

The problem is that you are asking to access the DisableInitializers function without defining it anywhere in your code. The correct definition of 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 to fix the error:

• Add the required import declaration:

pragma solidity ^0.8.0;

import "./BoxV1.sol";

This imports the BoxV1 contract from the second file.

• Define the DisableInitializers function:

function _disableInitializers() extern {

    // implement DisableInitializers

}

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

• Update your code to use DisableInitializers:

//SPDX License ID: MI

pragma solidity ^0.8.0;


import "./BoxV1.sol";


function DisableInitializers() extern {

    _disableInitializers();

}

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

Example of use:

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

contract BoxV1 {

    function BoxV1() public {

        // initialize everything here...

    }


    function DisableInitializers() extern {

        _disableInitializers();

    }

}

With this updated code, you will be able to compile and run your contract without encountering the “Undeclared Identifier” error.

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