Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f9691a2b0aa6b6c49746c86fa19d0803e4cfac8a65ca66374105441eeff5c5af:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^