Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8ab6aeb103026118feb72fe284a0a1aa80878fbab797a8de4e7c0ec9c1610e8e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^