Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d5c38facad95cb4cd57a8cb5d1b295d7ed50b17349c762cf7341a40481f7a70f:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^