Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b60ca96fdacc04dc3cc6419f8f85e4144f200e08a9fc25c2697b267a4042a17c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^