Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 480339bdd45332ff1579608440dc5bb49180f7e8719d07c6cc8d2ce2c9681bf7:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^