Radar Relay moved from the old WETH contract to the new canonical WETH contract on January 8th 2018. Any WETH wrapped by the previous WETH contract will need to be unwrapped and rewrapped in the new WETH contract.
With some of the previous WETH contracts you can unwrap old WETH by interacting with the contract directly on Etherscan. Follow the steps provided in our support article on unwrapping WETH and use the previous WETH contract address.
*Note that the Contract ABI file is necessary for this process.
Old WETH contract address 0x2956356cd2a2bf3202f771f50d3d14a367b48070
New WETH contract address 0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2