Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5ddc49dc416d4c4c4121c517f6b6e366a1cfde75196903d8a6ec72b1ac0fdacf:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^