Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1b1a6868721fc4c10596ee67bb15ea1d512aecfc89bb1caedd0c5ea5ddbb8c14:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^