Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 30e4aeb7ffe62b769c2dae746df03caf4dca6b3ca095a7737a10d4f685bb8757:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^