Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 05d210fcd629df06059a2ef2be138f1735cb48fb9630c6afd46f740a5cc4ae91:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^