Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d06b269aa8f9ff0c66bb3c9ced8bf1b514c89b8bbc22c126a055d80845d67d2b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^