Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 2baccb14d9b6ce55c0d64a6da800ea25d3db0f5e3f4971e9249e972848feb079:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^