Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f968f18730fb05b823d81dafa9a637f992d40f5cd7dcdbc200f3084e2075a3f5:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^