Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b89ccaca0e890ae17c715bd9f513fa88b9dbb4ad7f7d2128e940402a75084ee0:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^