DeclarationError: Identifier already declared. Two imports import the same ERC721 contract

Question

Im building a contract that uses two contracts that both use the ERC721 zeppelin contract, when I import the two as such:

import nonFungableWidthAddedFunctionality1.sol;
import nonFungableWidthAddedFunctionality2.sol;

I get the following error:

$PATH DeclarationError: Identifier already declared.
import "./../nonFungableWidthAddedFunctionality2.sol";
^--------------------------^
$PATH The previous declaration is here:
contract ERC721 {
^

Both of these contracts need the ERC721 implementation since they are also used separately.

Answer 1

You are declaring contract ERC721 more than once, thus the error.

Essentially, you're doing this:

contract Contract1 {
}

contract Contract1 {
}