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Thank you for your reply. No that's all. I'm creating with the objects by passing them an address. I try to access the functions at those at address. The empty functions are there so the compiler knows about them at compile time. I think they get overwritten by the actual functions when I use them. The functions I'm accessing are here: https://github.com/pancakeswap/pancake-smart-contracts/blob/master/projects/exchange-protocol/contracts/PancakeRouter.sol