Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d05f0a8db479ee590417d14cce91ea2f407037fc25f0d303e8a8c7d6ce28e134:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^