Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> edc002c6fc93bf2a8d805024739588afe8630acb7092d806bf565800e2869df3:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^