Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3cd189749e677df6e37c2a43f6ec9099828b5cc0cca1398e55d67d32b28bfb11:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^