[UniswapError: invalid from or to contract tokens]

[lamman1820]

const uniswapPair = new UniswapPair({
    // the contract address of the token you want to convert FROM
    fromTokenContractAddress: '0x419D0d8BdD9aF5e606Ae2232ed285Aff190E711b',
    // the contract address of the token you want to convert TO
    toTokenContractAddress: '0x1985365e9f78359a9B6AD760e32412f4a445E862',
    // the ethereum address of the user using this part of the dApp
    ethereumAddress: '0xB1E6079212888f0bE0cf55874B2EB9d7a5e02cD9',
    chainId: ChainId.RINKEBY,
  });
    // now to create the factory you just do
    const uniswapPairFactory = await uniswapPair.createFactory();
    //the amount is the proper entered amount
    // so if they enter 10 pass in 10
    // it will work it all out for you
    const trade = await uniswapPairFactory.trade(10);

I try to get the trade information but it always shows the error: invalid from or to contract tokens.

Please help to check it.

Thanks

[joshstevens19]

Hey you are using mainnet contract address which are not correct on rinkeby!

As you see > https://rinkeby.etherscan.io/address/0x1985365e9f78359a9B6AD760e32412f4a445E862 is not a contract but on mainnet > https://etherscan.io/address/0x1985365e9f78359a9B6AD760e32412f4a445E862

same with fun token see > https://rinkeby.etherscan.io/address/0x419D0d8BdD9aF5e606Ae2232ed285Aff190E711b is not a contract but on mainnet > https://etherscan.io/address/0x419D0d8BdD9aF5e606Ae2232ed285Aff190E711b

If you want to use testnets you have to use the correct token addresses for what you want to swap. In your code snippet if you change

chainId: ChainId.RINKEBY to chainId: ChainId.MAINNET

Then the quotes will work.