Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> dd54a03a252423acb097bf028bd6ee65f5482cdf8b2ca9879d423ded019d2e8c:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^