Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3ff4c35eed624b309b6b11af33e5dba865d30cc58d450b7095b022b0369aa87a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^