Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 111eb66af9c8ff23e45f49c656fc65c5681b7c5be33d94c8f9e9a5173653bb0c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^