Ethereum: Undeclared Identifier `_disableInitializers();`

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

Error (7576): Undeclared identifier
--> src/BoxV1.sol:32:9:
|
32 | _disableInitializers();

The problem is that you are trying to access the function «DisableInitializers» 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 that DisableInitializers is a custom function defined elsewhere, here’s how you can fix the error:

• Apply the necessary import declaration:

pragma persistence ^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 have used a different function naming convention here, but it should match the one defined in the imported contract («BoxV1.sol»).

• Update the code to use DisableInitializers:

//SPDX-LicenseID: MI
pragma persistence ^0.8.0;
import "./BoxV1.sol";
function DisableInitializers() external {
_disableInitializers();
}

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

Usage example:

You can now call DisableInitializers on the BoxV1 instance, for example:

BoxV1 contract {
function BoxV1() public {
// initialize everything here...
}
function DisableInitializers() external {
_disableInitializers();
}
}

With this updated code, you should be able to create and execute a contract without encountering the «Undeclared identifier» error.

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