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.
You can unwrap old WETH on the 0x Portal.
Make sure your Metamask or Ledger is connected and use the portal at the bottom of the page to unwrap any old WETH.
You will need to confirm this action using Metamask or Ledger.