Please ensure you are compiling smart contracts to --evm-version byzantium
You can build and run the above Geth clone locally to connect to our ETH Sidechain:
https://mainrpc.elaeth.io
For more info visit our sub-site: elaeth.io . This is hosted by the community run CR ETH Task Force and they take no liability for any issues.
You can find tutorials on setting up an Elastos ETH Sidechain dev environment and more here.