Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 2e287f3c765ba7bb694f6179658afd3ae0ec1f8ee83e7a7ed3f747ae4c972c87:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^