Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f2fa77cd6b730e4f6b4bf0d23af649165cbfd27b25e12f5a502d7c689e3fc15a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^