Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b2200a88efa5c33146aeed23929346bc03b7f273f84da4994f507f8754020f27:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^