Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 9cbbe0ba04018b6d685126adc4fc7070ee78635ed1d379c3f5125aa16c7d7eeb:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^