Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> de1e5b2d118aa7188769cbe2ccbdd97e9adb81940a1b8c512b9466850a7ee74d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^