Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f08198b921c3170d5095ae37e9cbc7421406cf5b08f3ebd34de99cb7e4180ffe:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^