Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b83a392d8aa77152ffae52d88d2e2b28b31d0c15e6dc62c2bc4a359e064ca25c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^