Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b7c6447db7540e264f18ec89a07af343f999639954e314bec60aafc128fb8f5f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^