Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d98a6ddd5fc9f93b0acd4a1302d6cd9b74695ec5307ae196cda6d13fcd9071c4:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^