Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b42ccfa2d6fd9ed26ef3ea402b2b926675e92416a1f8fcc7b2cccd69b449bee0:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^