Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 9f6090fb516a6dd6604fdd08cae8a85c3375d081c9be2f4cf1e1cb5f846f2f97:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^