Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6291c836dd6b51756a1d628c6bb92e9c4c7f49b29d33e71cf7234f334262235b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^