Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6db950cbc5e400e10138fa56311f7351b30fda56dfc59ded49050c13bc2d5d69:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^