Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 04dd835bb81a8790a548ceeb5fa682e54d162a1b6afbcd07c56883d7ccee116d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^