Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> a018dd0c6b82a1c9959db926ea2af6d6e517a81c99134b177f8dd15b1a211861:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^