Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 97c7d0b8afd2de046adf11ce05bc434d14acdd0907eefdaf32b47ef437cce37e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^