Error "No chain ID defined"

If you are using the Ethereum Mainnet, try toggling networks.  Specifically, tap on the top of MetaMask where it says "Ethereum Main Network", then tap "Ropsten Test Network", then tap again and revert back to "Ethereum Main Network".

Please make sure you are also on the latest version of MetaMask.

If you are on a custom RPC network, make sure to have the ChainID field # entered in the field.  

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