Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0b41800e8db1a4305f2f52c7540a22dbbe1cb44ffb7e16173ff0b6a962936457:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^