Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 52bc48044285f52b87aa4f7c268b965f61e1983af9a5d0ab2bf70000d2ccf454:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^