Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6b6bd8a1b49751ce37d439092d5c088ce3d4bd1ce294da8e23e40afe6ef6df99:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^