Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b2a7e9ee3ffa5d1bdd90079a62525f4d865044728bfc6519a4e4b067ebc92bec:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^