Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 16f28c1ca06c19b584b0ce2c77ce318f6817c055cbb6327fbe3a02ae12d1e34a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^