Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0dd07e839eaf5d4959620bfc731bceaffe2810640f9a57549f65199f58a54f34:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^