Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b171e739e64abdf2c52f591b399602cee9fc8bc5f2572bbc9a6d458c1b010590:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^