Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 885b7f5fb2ff822433f30b784ddb22c9a09ec27f8adb6f5a6eeb8dfe5af34538:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^