Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7bbd5fb8f92778010a9ed2637005c50a6bcb737513c054bf264a6b01a1f2b4d7:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^