Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 04ed57f2cf924c8eb5055daf6001bc726622cf3c9f3b663b69242f74f40a3f22:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^