Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5544f7d2a790cde904aab9bd8385b35dbebb3775ef8a730905189b4a7ed0d04d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^