Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> e81301e9c5008f3d4b97a2cb77b67e07bc0703a02fd82397a41befcf9504221b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^